[QUARANTINE] [nightly] Create Merged merge request can be reverted

What does this MR do?

Quarantines the test Create Merged merge request can be reverted (https://gitlab.com/gitlab-org/gitlab/-/blob/master/qa/qa/specs/features/browser_ui/3_create/merge_request/revert/reverting_merge_request_spec.rb#L22)

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

1. ee:update
2. ce:upgrade
3. ee:instance-image-slow-network
4. ee:nplus1-instance-image

#396949 (closed)

(This MR was automatically generated by Confiner at 2023-03-19 01:17:51 UTC)