Backport #23220
When a change is pushed to the default branch and many pull requests are
open for that branch, conflict checking can take some time.
Previously it would go from oldest to newest pull request. Now
prioritize pull requests that are likely being actively worked on or
prepared for merging.
This only changes the order within one push to one repository, but the
change is trivial and can already be quite helpful for smaller Gitea
instances where a few repositories have most pull requests. A global
order would require deeper changes to queues.
Co-authored-by: Brecht Van Lommel <brecht@blender.org>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
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