Move database operations of merging a pull request to post receive hook and add a transaction (#30805) #30888
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Backport #30805 by @lunny
Merging PR may fail because of various problems. The pull request may have a dirty state because there is no transaction when merging a pull request. ref #25741 (comment)
This PR moves all database update operations to post-receive handler for merging a pull request and having a database transaction. That means if database operations fail, then the git merging will fail, the git client will get a fail result.
There are already many tests for pull request merging, so we don't need to add a new one.