Ignore unknown project ID in RepositoryUpdateMirrorWorker
Projects that are in pending_delete could still trigger the mirror,
leading to undefined method mark_import_as_failed
errors and
repeated Sidekiq retries.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Projects that are in pending_delete could still trigger the mirror,
leading to undefined method mark_import_as_failed
errors and
repeated Sidekiq retries.