Slack notifications not working for pipeline jobs - Handle rate limit events

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I have added a slack integration to my project. I am getting notifications for push events - however, pipeline jobs notifications are not working.

Proposal

Some notifications are rate-limited, which we currently don't handle: #356896 (comment 934257676)

To fix this I think we would need to reschedule the failed ProjectServiceWorker job, using retry_after from the response (which might be minutes or seconds).