[QUARANTINE] [nightly] Create Create a new merge request creates a merge request with a milestone and label

What does this MR do?

Quarantines the test Create Create a new merge request creates a merge request with a milestone and label (https://gitlab.com/gitlab-org/gitlab/-/blob/master/qa/qa/specs/features/browser_ui/3_create/merge_request/create_merge_request_spec.rb#L37)

This test has been found by Confiner to have failed 10 times, which exceeds the threshold of 3 times.

1. ce:update
2. ee:update
3. ee-previous-to-ce:update
4. ce:upgrade
5. ce:instance-image
6. ee:instance-image
7. ce:instance-image-slow-network
8. ee:instance-image-slow-network
9. ce:nplus1-instance-image
10. ee:nplus1-instance-image

#360543 (closed)

(This MR was automatically generated by Confiner at 2022-05-13 01:17:57 UTC)