ci: enable 9.* branches (#4433)

Author: v1v

catalog-info.yaml

@@ -45,12 +45,13 @@ spec:
     spec:
       repository: elastic/fleet-server
       pipeline_file: ".buildkite/pipeline.yml"
-      branch_configuration: "main 8.* 7.* v8.* v7.*"
+      branch_configuration: "main 9.* 8.* 7.*"
       provider_settings:
         build_pull_request_forks: false
         build_pull_requests: true # requires filter_enabled and filter_condition settings as below when used with buildkite-pr-bot
-        build_tags: true
+        build_tags: false
         filter_enabled: true
+        # TODO: what's the reason for this filter?
         filter_condition: >-
           build.pull_request.id == null || (build.creator.name == 'elasticmachine' && build.pull_request.id != null)
       env:
@@ -94,6 +95,7 @@ spec:
         build_tags: false
         build_branches: false
         filter_enabled: true
+        # TODO: what's the reason for this filter?
         filter_condition: >-
           build.pull_request.id == null || (build.creator.name == 'elasticmachine' && build.pull_request.id != null)
       env:
@@ -102,9 +104,9 @@ spec:
         SLACK_NOTIFICATIONS_ALL_BRANCHES: 'false'
         SLACK_NOTIFICATIONS_ON_SUCCESS: 'false'
       cancel_intermediate_builds: true
-      cancel_intermediate_builds_branch_filter: '!main !7.* !8.*'
+      cancel_intermediate_builds_branch_filter: '!main !7.* !8.* !9.*'
       skip_intermediate_builds: true
-      skip_intermediate_builds_branch_filter: '!main !7.* !8.*'
+      skip_intermediate_builds_branch_filter: '!main !7.* !8.* !9.*'
       teams:
         ingest-fp:
           access_level: MANAGE_BUILD_AND_READ
@@ -175,12 +177,13 @@ spec:
         build_tags: false
         build_branches: false
         filter_enabled: true
+        # TODO: what's the reason for this filter?
         filter_condition: >-
           build.pull_request.id == null || (build.creator.name == 'elasticmachine' && build.pull_request.id != null)
       cancel_intermediate_builds: true
-      cancel_intermediate_builds_branch_filter: '!main !7.* !8.*'
+      cancel_intermediate_builds_branch_filter: '!main !7.* !8.* !9.*'
       skip_intermediate_builds: true
-      skip_intermediate_builds_branch_filter: '!main !7.* !8.*'
+      skip_intermediate_builds_branch_filter: '!main !7.* !8.* !9.*'
       teams:
         ingest-fp:
           access_level: MANAGE_BUILD_AND_READ