Backport https://github.com/go-gitea/gitea/pull/39980
Following a bot user from its profile succeeded but answered with an
error, because the follow handler only rendered a response for
individuals and organizations.
The cherry-pick conflicted in `OwnerProfile`, which still serves the
user feeds on `release/v28`.
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>