Reschedule_once duplication strategy for EntityWorker

What does this MR do and why?

This worker re-queues itself, sometimes due to the timing it could re-queue and then deduplicate itself. See screenshot in linked issue.

This MR changes the deduplication once, and also increasing the delay time for perform_async to reduce the occurance.

Screenshots or screen recordings

Screenshots are required for UI changes, and strongly recommended for all other merge requests.

Before	After

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #429606 (closed)