Last known backend change for #11311, fixing up some loose ends on the repository APIs related to repo-specific access tokens.
Adds automated testing, and aligns permissions where necessary, to ensure that repo-specific access tokens can't change the administrative state of the repositories that they are limited to.
Repo-specific access tokens cannot be used to:
- convert a mirror into a normal repo,
- create a new repository from a template,
- transfer ownership of a repository
- create a new repository (already protected, but test automation added),
- delete a repository (already protected, but test automation added),
- editing a repository's settings (already protected, but test automation added).
**Breaking**: The template generation (`POST /repos/{template_owner}/{template_repo}/generate`) and repository deletion (`DELETE /repos/{username}/{reponame}`) APIs have been updated to require the same permission scope as creating a new repository. Either `write:user` or `write:organization` is required, depending on the owner of the repository being created or deleted.
## Checklist
The [contributor guide](https://forgejo.org/docs/next/contributor/) contains information that will be helpful to first time contributors. There also are a few [conditions for merging Pull Requests in Forgejo repositories](https://codeberg.org/forgejo/governance/src/branch/main/PullRequestsAgreement.md). You are also welcome to join the [Forgejo development chatroom](https://matrix.to/#/#forgejo-development:matrix.org).
### Tests for Go changes
- I added test coverage for Go changes...
- [ ] in their respective `*_test.go` for unit tests.
- [x] in the `tests/integration` directory if it involves interactions with a live Forgejo server.
- I ran...
- [x] `make pr-go` before pushing
### Documentation
- [ ] I created a pull request [to the documentation](https://codeberg.org/forgejo/docs) to explain to Forgejo users how to use this change.
- [x] I did not document these changes and I do not expect someone else to do it.
### Release notes
- [x] This change will be noticed by a Forgejo user or admin (feature, bug fix, performance, etc.). I suggest to include a release note for this change.
- [ ] This change is not visible to a Forgejo user or admin (refactor, dependency upgrade, etc.). I think there is no need to add a release note for this change.
Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/11736
Reviewed-by: Andreas Ahlenstorf <aahlenst@noreply.codeberg.org>
Co-authored-by: Mathieu Fenniak <mathieu@fenniak.net>
Co-committed-by: Mathieu Fenniak <mathieu@fenniak.net>
