[QUARANTINE] Manage Gitlab migration with merge request successfully imports merge request

What does this MR do?

Quarantines the test Manage Gitlab migration with merge request successfully imports merge request (https://gitlab.com/gitlab-org/gitlab/-/blob/master/qa/qa/specs/features/api/1_manage/migration/gitlab_migration_mr_spec.rb#L47)

This test has been found by Confiner to have been failing for more than (or equal to) 3 times. This test has failed 3 times.

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

#351050 (closed)

(This MR was automatically generated by Confiner at 2022-01-25 01:18:25 UTC)