Quarantine Group Iteration test

What does this MR do?

MR quarantines qa/specs/features/ee/browser_ui/2_plan/iterations/create_group_iteration_spec.rb to unblock staging deployments.

Group Iterations page has seen some changes recently and it can be switched out with the new version that has a different vue component, leading the existing test to break.

E2E Test Failure issue(s)

#334252 (closed)

Check-list

• General code guidelines check-list
  • Code review guidelines
  • Style guides
• Quarantine test check-list
  • Follow the Quarantining Tests guide.
  • Confirm the test has a quarantine: tag with the specified quarantine type.
  • Note if the test should be quarantined for a specific environment.
• Dequarantine test check-list
  • Follow the Dequarantining Tests guide.
  • Confirm the test consistently passes on the target GitLab environment(s).
    • (Optionally) Trigger a manual GitLab-QA pipeline against a specific GitLab environment using the RELEASE variable from the package-and-qa job of the current merge request.
• To ensure a faster turnaround, ask in the #quality Slack channel for someone to review and merge the merge request, rather than assigning it directly.