Regression of #29493. If a branch has been deleted, repushing it won't
restore it.
Lunny may have noticed that, but I didn't delve into the comment then
overlooked it:
https://github.com/go-gitea/gitea/pull/29493#discussion_r1509046867
The additional comments added are to explain the issue I found during
testing, which are unrelated to the fixes.
Unlike other async processing in the queue, we should sync branches to
the DB immediately when handling git hook calling. If it fails, users
can see the error message in the output of the git command.
It can avoid potential inconsistency issues, and help #29494.
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Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
