[Buildkite] Update filter to use api source (elastic#9717)

Author: mrodm

catalog-info.yaml

@@ -50,7 +50,7 @@ spec:
         build_tags: false
         filter_enabled: true
         filter_condition: >-
-          build.pull_request.id == null || (build.creator.name == 'elasticmachine' && build.pull_request.id != null && build.source == 'webhook')
+          build.pull_request.id == null || (build.creator.name == 'elasticmachine' && build.pull_request.id != null && build.source == 'api')
       repository: elastic/integrations
       cancel_intermediate_builds: true
       cancel_intermediate_builds_branch_filter: '!main !backport-*'
@@ -99,7 +99,7 @@ spec:
         build_tags: false
         filter_enabled: true
         filter_condition: >-
-          build.pull_request.id == null || (build.creator.name == 'elasticmachine' && build.pull_request.id != null && build.source == 'webhook')
+          build.pull_request.id == null || (build.creator.name == 'elasticmachine' && build.pull_request.id != null && build.source == 'api')
       repository: elastic/integrations
       cancel_intermediate_builds: true
       cancel_intermediate_builds_branch_filter: '!main'
@@ -146,7 +146,7 @@ spec:
         build_tags: false
         filter_enabled: true
         filter_condition: >-
-          build.pull_request.id == null || (build.creator.name == 'elasticmachine' && build.pull_request.id != null && build.source == 'webhook')
+          build.pull_request.id == null || (build.creator.name == 'elasticmachine' && build.pull_request.id != null && build.source == 'api')
       repository: elastic/integrations
       cancel_intermediate_builds: true
       cancel_intermediate_builds_branch_filter: '!main'
@@ -188,7 +188,7 @@ spec:
         build_tags: false
         filter_enabled: true
         filter_condition: >-
-          build.pull_request.id == null || (build.creator.name == 'elasticmachine' && build.pull_request.id != null && build.source == 'webhook')
+          build.pull_request.id == null || (build.creator.name == 'elasticmachine' && build.pull_request.id != null && build.source == 'api')
       repository: elastic/integrations
       cancel_intermediate_builds: true
       cancel_intermediate_builds_branch_filter: '!main'
@@ -232,7 +232,7 @@ spec:
         build_tags: false
         filter_enabled: true
         filter_condition: >-
-          build.pull_request.id == null || (build.creator.name == 'elasticmachine' && build.pull_request.id != null && build.source == 'webhook')
+          build.pull_request.id == null || (build.creator.name == 'elasticmachine' && build.pull_request.id != null && build.source == 'api')
       repository: elastic/integrations
       cancel_intermediate_builds: true
       cancel_intermediate_builds_branch_filter: '!main !backport-*'