[QUARANTINE] [nightly] Verify Group runner registration user registers a new group runner

What does this MR do?

Quarantines the test Verify Group runner registration user registers a new group runner (https://gitlab.com/gitlab-org/gitlab/-/blob/master/qa/qa/specs/features/browser_ui/4_verify/runner/register_group_runner_spec.rb#L19)

This test has been found by Confiner to have failed 5 times, which exceeds the threshold of 3 times.

1. ee:airgapped
2. ee:airgapped
3. ee:airgapped
4. ee:airgapped
5. ee:airgapped

#390184 (closed)

(This MR was automatically generated by Confiner at 2023-03-08 01:17:44 UTC)