[QUARANTINE] Verify Pipeline editor can create merge request

What does this MR do?

Quarantines the test Verify Pipeline editor can create merge request (https://gitlab.com/gitlab-org/gitlab/-/blob/master/qa/qa/specs/features/browser_ui/4_verify/pipeline/pipeline_editor_can_create_merge_request_spec.rb#L24)

This test has been found by Confiner to have failed 4 times, which exceeds the threshold of 3 times.

1. ee:instance-parallel
2. ee:relative_url-parallel
3. ee:update-parallel
4. ee:praefect-parallel

#356056 (closed)

(This MR was automatically generated by Confiner at 2022-03-17 01:18:54 UTC)