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/hooks/post-update.sample

@@ -0,0 +1,8 @@
+#!/bin/sh
+#
+# An example hook script to prepare a packed repository for use over
+# dumb transports.
+#
+# To enable this hook, rename this file to "post-update".
+
+exec git update-server-info