Backend: Follow-up: Unified RetryJob Service - use EventStore in run_after_commit block

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This is an immediate follow-up to: !79636 (closed)

Ideally we could convert the run_after_commit block into:

new_job.run_after_commit do
 event = Ci::JobRetriedEvent.new(data: { old_job_id: job.id, new_job_id: new_job.id }
 ::Gitlab::EventStore.publish(event)
end

and have the 3 side effects (the service objects from other domains) run asynchronously (instead of synchronously) as subscribers of the event. We could do this in a follow-up though.