API: Remove `DELETE projects/:id/deploy_keys/:key_id/disable`
What does this MR do?
This removes a duplicated API endpoint to remove a deploy key from a project.
Does this MR meet the acceptance criteria?
- 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
What are the relevant issue numbers?
Closes #28286 (closed)