Remove RepositoryPushAuditEventWorker
Description
We've made RepositoryPushAuditEventWorker
a no-op sidekiq worker in %15.0 via !86131 (merged) so that any queued jobs in redis for this worker could be drained. We missed doing this in the initial MR !85521 (merged) to remove this worker. As part of this issue we need to completely remove this worker from the codebase.
Implementation Plan
Remove all occurrences of RepositoryPushAuditEventWorker
basically a revert of !86131 (merged).