[QUARANTINE] Create Push Rules using non signed commits restricts users by email format

What does this MR do?

Quarantines the test Create Push Rules using non signed commits restricts users by email format (https://gitlab.com/gitlab-org/gitlab/-/blob/master/qa/qa/specs/features/ee/browser_ui/3_create/repository/push_rules_spec.rb#L58)

This test has been found by Confiner to have failed 8 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
5. ee:instance-parallel
6. ee:relative_url-parallel
7. ee:update-parallel
8. ee:praefect-parallel

#354787 (closed)

(This MR was automatically generated by Confiner at 2022-04-14 01:21:15 UTC)