Dequarantine design E2E tests

What does this MR do?

Dequarantines three design tests against Review Apps. The failure cause appears to be due to assets mismatch that happens during deploy sometimes. The tests themselves pass consistently on other environments and against correctly deployed Review Apps on master - https://gitlab-review-mastermain-mk1cr0.gitlab-review.app/users/sign_in. Similar deploy issues are being tracked in #383626 (closed) and there is no value in quarantining individual tests.

Also adds missing product_group metadata.

E2E Test Failure issue(s)

#366839 (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.
  • (Optionally) In case of an emergency (e.g. blocked deployments), consider adding labels to pick into auto-deploy (Pick into auto-deploy priority1 severity1).
• Dequarantine test check-list
  • Follow the Dequarantining Tests guide.
  • Confirm the test consistently passes on the target GitLab environment(s).
• To ensure a faster turnaround, ask in the #quality_maintainers Slack channel for someone to review and merge the merge request, rather than assigning it directly.