Fix redirect with non-ascii branch names (#4764) (#4810)

* Fix redirect with non-ascii branch names (#4764)

* Add integration tests for non-ascii branch redirect

* Fix mysql test and coverage test

integrations/gitea-repositories-meta/user2/utf8.git/objects/28/d579e4920fbf4f66e71dab3e779d9fbf41422a

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integrations/gitea-repositories-meta/user2/utf8.git/objects/eb/f146f803fccbc1471ef01d8fa0fe12c14e61a5

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integrations/gitea-repositories-meta/user2/utf8.git/objects/info/packs

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