Disallow reopening of locked merge request
What does this MR do?
It prevents reopening of locked merge requests. This MR is basically a clone of !21299 (merged) for merge requests.
Note: I did not add specific tests as !21299 (merged) did, because app/policies/merge_request_policy is generally not tested at the moment (as opposed to issues_policy). I can add this if necessary.
What are the relevant issue numbers?
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Documentation created/updated via this MR -
Documentation reviewed by technical writer or follow-up review issue created -
Tests added for this feature/bug -
Tested in all supported browsers -
Conforms to the code review guidelines -
Conforms to the merge request performance guidelines -
Conforms to the style guides -
Conforms to the database guides -
Security reports checked/validated by reviewer