[QUARANTINE] Plan Group issue boards shows multiple group boards in the boards dropdown menu

What does this MR do?

Quarantines the test Plan Group issue boards shows multiple group boards in the boards dropdown menu (https://gitlab.com/gitlab-org/gitlab/-/blob/master/qa/qa/specs/features/ee/browser_ui/2_plan/issue_boards/group_issue_boards_spec.rb#L28)

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

1. e2e:package-and-test-results
2. e2e:package-and-test-results
3. e2e:package-and-test-results

#375840 (closed)

(This MR was automatically generated by Confiner at 2022-10-01 02:08:59 UTC)