Devon Hudson 1efb826b54
Delete unreferenced state groups in background (#18254)
This PR fixes #18154 to avoid de-deltaing state groups which resulted in
DB size temporarily increasing until the DB was `VACUUM`'ed. As a
result, less state groups will get deleted now.
It also attempts to improve performance by not duplicating work when
processing state groups it has already processed in previous iterations.

### Pull Request Checklist

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* [X] [Code
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---------

Co-authored-by: Erik Johnston <erikj@element.io>
2025-03-21 17:09:49 +00:00
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