fix(ci): restore agentbeat pipeline in catalog-info.yaml (#48367)

This pipeline was removed as part of #48147. Agentbeat is intended to be removed from 9.3 onwards, but the other supported version branches still rely on it.

(cherry picked from commit fbef8de)

Author: mauri870

catalog-info.yaml

@@ -1034,6 +1034,55 @@ spec:
         everyone:
           access_level: BUILD_AND_READ
 
+# TODO: Remove the following pipeline once agentbeat is no longer required by any supported version.
+---
+# yaml-language-server: $schema=https://gist.githubusercontent.com/elasticmachine/988b80dae436cafea07d9a4a460a011d/raw/rre.schema.json
+apiVersion: backstage.io/v1alpha1
+kind: Resource
+metadata:
+  name: buildkite-pipeline-beats-xpack-agentbeat
+  description: "Beats x-pack agentbeat pipeline"
+  links:
+    - title: Pipeline
+      url: https://buildkite.com/elastic/beats-xpack-agentbeat
+
+spec:
+  type: buildkite-pipeline
+  owner: group:ingest-fp
+  system: platform-ingest
+  implementation:
+    apiVersion: buildkite.elastic.dev/v1
+    kind: Pipeline
+    metadata:
+      name: beats-xpack-agentbeat
+      description: "Beats x-pack agentbeat pipeline"
+    spec:
+      # branch_configuration: "main 8.*"         #TODO: uncomment after tests
+      pipeline_file: ".buildkite/x-pack/pipeline.xpack.agentbeat.yml"
+      maximum_timeout_in_minutes: 120
+      provider_settings:
+        trigger_mode: none # don't trigger jobs from github activity
+        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
+        filter_enabled: true
+        filter_condition: >-
+          build.pull_request.id == null || (build.creator.name == 'elasticmachine' && build.pull_request.id != null)
+      repository: elastic/beats
+      cancel_intermediate_builds: true
+      cancel_intermediate_builds_branch_filter: "!main !8.* !9.*"
+      skip_intermediate_builds: true
+      skip_intermediate_builds_branch_filter: "!main !8.* !9.*"
+      env:
+        # TODO set to true once https://github.com/elastic/ingest-dev/issues/3001 has been resolved
+        ELASTIC_PR_COMMENTS_ENABLED: "false"
+      teams:
+        ingest-fp:
+          access_level: MANAGE_BUILD_AND_READ
+        everyone:
+          access_level: BUILD_AND_READ
+
+
 ---
 # yaml-language-server: $schema=https://gist.githubusercontent.com/elasticmachine/988b80dae436cafea07d9a4a460a011d/raw/rre.schema.json
 apiVersion: backstage.io/v1alpha1