Incorporate fixes from VSCode regarding Environment collection API

[karrtikr]

Results from spike #20492. Issues to tackle next to start using environment variables for activation:

• Allow specifying workspace-specific EnvironmentVariableCollection mutators vscode#171173
• Allow specifying prompt prefix via Environment variable collection vscode#188969
• EnvironmentVariableCollection.description only works for one extension vscode#186859
• EnvironmentVariableCollection.description is not shown in the hover when the environment is stale vscode#186798
• Allow to provide description to environment collection API vscode#171108
• env set in my fish config prevails over what I set in the env var collection vscode#184009
• Prepending fails on zsh with only shell integration enabled vscode#188875
• Add isProposedApiEnabled check for env var scope vscode#182966
• Revert change to always update status vscode#181755
• https://github.com/microsoft/vscode-internalbacklog/issues/3801
• Description is not changing for terminals which are not interacted with vscode#180851
• Allow EnvironmentVariableCollection API to apply changes via shell integration vscode#179476
• Ensure we use correct workspace folder for remote terminals vscode#180486
• Improve terminal action hover UI vscode#180739
• Allow an extension to control a terminal tab title/description variable vscode#171175
• Surface environment variable information in hover, even when not stale vscode#177078
• Add terminal tab hover action to show environment variable contributions vscode#177128
• EnvironmentVariableCollection API enhancements vscode#182069

Once these are done, implement using them in the Python extension:

• Support pythonTerminalEnvVarActivation experiment in multiroot workspaces #21101
• Set environment variables as part of shell integration using VSCode API #21297
• Prompt does not show up for terminal activation #20827
• Show notification reaffirming Python extension still handles activation even if no prompt is shown #21793

[karrtikr]

Each shell can have slightly different sets of variable, so collection API should probably support scoping based on shell as well in addition to workspace, altering the proposed API here: microsoft/vscode#171173. Example:

• Variables to be set for powershell for a conda env "julia":

C:\Users\karraj>conda shell.powershell+json activate julia
{
  "path": {
    "PATH": [
      "C:\\Users\\karraj\\Miniconda3\\envs\\julia",
      "C:\\Users\\karraj\\Miniconda3\\envs\\julia\\Library\\mingw-w64\\bin",
      "C:\\Users\\karraj\\Miniconda3\\envs\\julia\\Library\\usr\\bin",
      "C:\\Users\\karraj\\Miniconda3\\envs\\julia\\Library\\bin",
      "C:\\Users\\karraj\\Miniconda3\\envs\\julia\\Scripts",
      "C:\\Users\\karraj\\Miniconda3\\envs\\julia\\bin",
      "C:\\Users\\karraj\\micromamb\\condabin",
      "C:\\Program Files\\Common Files\\Microsoft Shared\\Microsoft Online Services",
      "C:\\Program Files (x86)\\Common Files\\Microsoft Shared\\Microsoft Online Services",
      "C:\\WINDOWS\\system32",
      "C:\\WINDOWS",
      "C:\\WINDOWS\\System32\\Wbem",
      "C:\\WINDOWS\\System32\\WindowsPowerShell\\v1.0",
      "C:\\Program Files\\Git\\cmd",
      "C:\\Users\\karraj\\AppData\\Roaming\\nvm",
      "C:\\Program Files\\nodejs",
      "C:\\Program Files\\Git LFS",
      "C:\\WINDOWS\\system32",
      "C:\\WINDOWS",
      "C:\\WINDOWS\\System32\\Wbem",
      "C:\\WINDOWS\\System32\\WindowsPowerShell\\v1.0",
      "C:\\Program Files (x86)\\NVIDIA Corporation\\PhysX\\Common",
      "C:\\Program Files\\NVIDIA Corporation\\NVIDIA NvDLISR",
      "C:\\Program Files\\Docker\\Docker\\resources\\bin",
      "C:\\Users\\karraj\\AppData\\Local\\Programs\\Python\\Python37\\Scripts",
      "C:\\Users\\karraj\\AppData\\Local\\Programs\\Python\\Python37",
      "C:\\Users\\karraj\\AppData\\Local\\Programs\\Python\\Python39\\Scripts",
      "C:\\Users\\karraj\\AppData\\Local\\Programs\\Python\\Python39",
      "C:\\Users\\karraj\\AppData\\Local\\Programs\\Python\\Python36\\Scripts",
      "C:\\Users\\karraj\\AppData\\Local\\Programs\\Python\\Python36",
      "C:\\Users\\karraj\\.pyenv\\pyenv-win\\bin",
      "C:\\Users\\karraj\\.pyenv\\pyenv-win\\shims",
      "C:\\Program Files\\Common Files\\Microsoft Shared\\Microsoft Online Services",
      "C:\\Program Files (x86)\\Common Files\\Microsoft Shared\\Microsoft Online Services",
      "C:\\WINDOWS\\system32",
      "C:\\WINDOWS",
      "C:\\WINDOWS\\System32\\Wbem",
      "C:\\WINDOWS\\System32\\WindowsPowerShell\\v1.0",
      "C:\\WINDOWS\\System32\\OpenSSH",
      "C:\\Program Files\\OpenSSH",
      "C:\\Program Files\\Git\\cmd",
      "C:\\Users\\karraj\\AppData\\Roaming\\nvm",
      "C:\\Program Files\\nodejs",
      "C:\\Program Files\\Docker\\Docker\\resources\\bin",
      "C:\\ProgramData\\DockerDesktop\\version-bin",
      "C:\\Users\\karraj\\AppData\\Local\\Programs\\Python\\Python38\\Scripts",
      "C:\\Users\\karraj\\AppData\\Roaming\\Python\\Python38\\Scripts",
      "C:\\Users\\karraj\\AppData\\Local\\Programs\\Python\\Python38",
      "C:\\Users\\karraj\\Miniconda3",
      "C:\\Users\\karraj\\Miniconda3\\Library\\mingw-w64\\bin",
      "C:\\Users\\karraj\\Miniconda3\\Library\\usr\\bin",
      "C:\\Users\\karraj\\Miniconda3\\Library\\bin",
      "C:\\Users\\karraj\\Miniconda3\\Scripts",
      "C:\\Users\\karraj\\AppData\\Local\\Microsoft\\WindowsApps",
      "C:\\Users\\karraj\\AppData\\Local\\Programs\\Microsoft VS Code Insiders\\bin",
      "c:\\Users\\karraj\\AppData\\Roaming\\Code - Insiders\\User\\globalStorage\\ms-vscode-remote.remote-containers\\cli-bin",
      "C:\\Users\\karraj\\AppData\\Local\\Microsoft\\WindowsApps",
      "C:\\Users\\karraj\\AppData\\Local\\Programs\\Microsoft VS Code\\bin",
      ".",
      "C:\\Users\\karraj\\.vscode-server-launcher\\bin",
      "C:\\Program Files\\JetBrains\\PyCharm Community Edition 2022.3.2\\bin",
      "."
    ]
  },
  "vars": {
    "export": {
      "CONDA_PREFIX": "C:\\Users\\karraj\\Miniconda3\\envs\\julia",
      "CONDA_SHLVL": 1,
      "CONDA_DEFAULT_ENV": "julia",
      "CONDA_PROMPT_MODIFIER": "(julia) ",
      "CONDA_EXE": "C:\\Users\\karraj\\Miniconda3\\Scripts\\conda.exe",
      "_CE_M": "",
      "_CE_CONDA": "",
      "CONDA_PYTHON_EXE": "C:\\Users\\karraj\\Miniconda3\\python.exe"
    },
    "unset": [],
    "set": {}
  },
  "scripts": {
    "activate": [],
    "deactivate": []
  }
}

• Variables to be set for the same env on bash:

C:\Users\karraj>conda shell.bash+json activate julia
{
  "path": {
    "PATH": [
      "/C/Users/karraj/Miniconda3/envs/julia",
      "/C/Users/karraj/Miniconda3/envs/julia/Library/mingw-w64/bin",
      "/C/Users/karraj/Miniconda3/envs/julia/Library/usr/bin",
      "/C/Users/karraj/Miniconda3/envs/julia/Library/bin",
      "/C/Users/karraj/Miniconda3/envs/julia/Scripts",
      "/C/Users/karraj/Miniconda3/envs/julia/bin",
      "/C/Users/karraj/micromamb/condabin",
      "/C/Program Files/Common Files/Microsoft Shared/Microsoft Online Services",
      "/C/Program Files (x86)/Common Files/Microsoft Shared/Microsoft Online Services",
      "/C/WINDOWS/system32",
      "/C/WINDOWS",
      "/C/WINDOWS/System32/Wbem",
      "/C/WINDOWS/System32/WindowsPowerShell/v1.0",
      "/C/Program Files/Git/cmd",
      "/C/Users/karraj/AppData/Roaming/nvm",
      "/C/Program Files/nodejs",
      "/C/Program Files/Git LFS",
      "/C/WINDOWS/system32",
      "/C/WINDOWS",
      "/C/WINDOWS/System32/Wbem",
      "/C/WINDOWS/System32/WindowsPowerShell/v1.0",
      "/C/Program Files (x86)/NVIDIA Corporation/PhysX/Common",
      "/C/Program Files/NVIDIA Corporation/NVIDIA NvDLISR",
      "/C/Program Files/Docker/Docker/resources/bin",
      "/C/Users/karraj/AppData/Local/Programs/Python/Python37/Scripts",
      "/C/Users/karraj/AppData/Local/Programs/Python/Python37",
      "/C/Users/karraj/AppData/Local/Programs/Python/Python39/Scripts",
      "/C/Users/karraj/AppData/Local/Programs/Python/Python39",
      "/C/Users/karraj/AppData/Local/Programs/Python/Python36/Scripts",
      "/C/Users/karraj/AppData/Local/Programs/Python/Python36",
      "/C/Users/karraj/.pyenv/pyenv-win/bin",
      "/C/Users/karraj/.pyenv/pyenv-win/shims",
      "/C/Program Files/Common Files/Microsoft Shared/Microsoft Online Services",
      "/C/Program Files (x86)/Common Files/Microsoft Shared/Microsoft Online Services",
      "/C/WINDOWS/system32",
      "/C/WINDOWS",
      "/C/WINDOWS/System32/Wbem",
      "/C/WINDOWS/System32/WindowsPowerShell/v1.0",
      "/C/WINDOWS/System32/OpenSSH",
      "/C/Program Files/OpenSSH",
      "/C/Program Files/Git/cmd",
      "/C/Users/karraj/AppData/Roaming/nvm",
      "/C/Program Files/nodejs",
      "/C/Program Files/Docker/Docker/resources/bin",
      "/C/ProgramData/DockerDesktop/version-bin",
      "/C/Users/karraj/AppData/Local/Programs/Python/Python38/Scripts",
      "/C/Users/karraj/AppData/Roaming/Python/Python38/Scripts",
      "/C/Users/karraj/AppData/Local/Programs/Python/Python38",
      "/C/Users/karraj/Miniconda3",
      "/C/Users/karraj/Miniconda3/Library/mingw-w64/bin",
      "/C/Users/karraj/Miniconda3/Library/usr/bin",
      "/C/Users/karraj/Miniconda3/Library/bin",
      "/C/Users/karraj/Miniconda3/Scripts",
      "/C/Users/karraj/AppData/Local/Microsoft/WindowsApps",
      "/C/Users/karraj/AppData/Local/Programs/Microsoft VS Code Insiders/bin",
      "/c/Users/karraj/AppData/Roaming/Code - Insiders/User/globalStorage/ms-vscode-remote.remote-containers/cli-bin",
      "/C/Users/karraj/AppData/Local/Microsoft/WindowsApps",
      "/C/Users/karraj/AppData/Local/Programs/Microsoft VS Code/bin;",
      "/C/Users/karraj/.vscode-server-launcher/bin",
      "/C/Program Files/JetBrains/PyCharm Community Edition 2022.3.2/bin"
    ]
  },
  "vars": {
    "export": {
      "CONDA_PREFIX": "C:\\Users\\karraj\\Miniconda3\\envs\\julia",
      "CONDA_SHLVL": 1,
      "CONDA_DEFAULT_ENV": "julia",
      "CONDA_PROMPT_MODIFIER": "(julia) ",
      "CONDA_EXE": "/C/Users/karraj/Miniconda3/Scripts/conda.exe",
      "_CE_M": "",
      "_CE_CONDA": "",
      "CONDA_PYTHON_EXE": "/C/Users/karraj/Miniconda3/python.exe"
    },
    "unset": [],
    "set": {
      "PS1": "(julia) "
    }
  },
  "scripts": {
    "activate": [],
    "deactivate": []
  }
}

cc/ @Tyriar