MergeRequests::PushOptionsHandlerService has been updated to allow
adding and removing labels to a merge request using git push options.
To create a new merge request and add 2 labels to it:
git push -u origin -o merge_request.create \
-o merge_request.label="My label 1" \
-o merge_request.label="My label 2"
To update an existing merge request and remove a label while
adding a different label:
git push -u origin -o merge_request.label="My added label" \
-o merge_request.unlabel="My removed label"
Issue https://gitlab.com/gitlab-org/gitlab-ce/issues/64320
