Port of https://github.com/go-gitea/gitea/pull/32204
(cherry picked from commit d6d3c96e6555fc91b3e2ef21f4d8d7475564bb3e)
Conflicts:
routers/api/v1/api.go
services/context/api.go
trivial context conflicts
Currently 'userxx' and 'orgxx' are both used as username in test files
when the user type is org, which is confusing. This PR replaces all
'userxx' with 'orgxx' when the user type is org(`user.type==1`).
Some non-trivial changes
1. Rename `user3` dir to `org3` in `tests/git-repositories-meta`
2. Change `end` in `issue reference` because 'org3' is one char shorter
than 'user3'

3. Change the search result number of `user/repo2` because
`user3/repo21` can't be searched now

4. Change the first org name getting from API because the result is
ordered by alphabet asc and now `org 17` is before `org25`


Other modifications are just find all and replace all.
Unit tests with SQLite are all passed.
---------
Co-authored-by: caicandong <1290147055@qq.com>
Fix#25558
Extract from #22743
This PR added a repository's check when creating/deleting branches via
API. Mirror repository and archive repository cannot do that.