Remove split_refresh_worker_notify_about_push feature flag

Marc Shawrequested to merge
remove-split-refresh-worker-notify-about-push-ff into master

Summary

Remove the split_refresh_worker_notify_about_push feature flag and make the async NotifyAboutPushWorker the default code path for sending push notifications on merge requests.

Changes

  • Removed Feature.enabled?(:split_refresh_worker_notify_about_push) conditional in MergeRequests::RefreshService
  • Deleted the feature flag YAML definition
  • Updated specs to reflect the async worker as the only code path

Related issues

Closes #580785 (closed)

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