fix calReleaseNumCommitsBehind (#24148)
`repoCtx.CommitsCount` is not reliably the commit count of the default
branch (Repository.GetCommitsCount depends on what is currently
displayed).
For instance on the releases page the commit count is correct:
https://codeberg.org/Codeberg/pages-server/releases
However it is not on the single page:
https://codeberg.org/Codeberg/pages-server/releases/tag/v4.6.2
This PR fixes this by removing a "fast branch" which was using this
field (I think this field should be removed, since it is a bit
unpredictable - but this would mean a larger refactoring PR).
_contributed in the context of @forgejo_
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Co-authored-by: Giteabot <teabot@gitea.io>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
bb2783860b
