Remove sync_metrics_dashboard feature flag

app/services/git/branch_hooks_service.rb

@@ -84,7 +84,6 @@ module Git
     end
 
     def enqueue_metrics_dashboard_sync
-      return unless Feature.enabled?(:sync_metrics_dashboards, project)
       return unless default_branch?
 
       ::Metrics::Dashboard::SyncDashboardsWorker.perform_async(project.id)

config/feature_flags/development/sync_metrics_dashboards.yml

----
-name: sync_metrics_dashboards
-introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/39658
-rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/241793
-milestone: '13.5'
-type: development
-group: group::apm
-default_enabled: false