Allow owners to fetch source code in CI builds
What does this MR do?
Due to different way of handling owners of a project, they were not allowed to fetch CI sources for project.
This adds a separate code path for handling owners, that are not admins.
Why was this MR needed?
- CHANGELOG entry added
- Documentation created/updated
- API support added
- Added for this feature/bug
- All builds are passing
- Conform by the merge request performance guides
- Conform by the style guides
Branch has no merge conflicts with
master(if it does - rebase it please)
- Squashed related commits together