Non-production MR to the fork.

Test executions of ci-uprev (like this) generate a "Draft: [TESTONLY]" merge request to the main repository (in this example, to mesa/mesa).

This action generates noise in the list of merge requests in the main project. Even tagging it as "draft" and screaming "TESTONLY" (perhaps screaming there even claims more attention), from time to time, produces reviews from developers.

To maintain the functionality idea of this merge request kind, we can remove this noise by creating this merge request into the fork used to do the test. Then, the merge request will live in the fork and prevent developers from losing time reviewing something that will never be merged.