Since forgejo/forgejo!10397 and forgejo/forgejo!12335 have landed, there shouldn't be a need for the `hooks` directory in each repository.
This PR cleans up the `tests/gitea-repositories-meta/*` testdata.
Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/12824
Reviewed-by: limiting-factor <limiting-factor@noreply.codeberg.org>
Reviewed-by: Gusted <gusted@noreply.codeberg.org>