Add e2e test for resource search and namespace filter issue

[nwmac]

Summary

Fixes #8656

Adds e2e tests for the issue where the resource search dialog appeared below the namespace filter when opened using the keyboard shortcut.

Checklist

• The PR is linked to an issue and the linked issue has a Milestone, or no issue is needed
• The PR has a Milestone
• The PR template has been filled out
• The PR has been self reviewed
• The PR has a reviewer assigned
• The PR has automated tests or clear instructions for manual tests and the linked issue has appropriate QA labels, or tests are not needed
• The PR has reviewed with UX and tested in light and dark mode, or there are no UX changes

[aalves08]

LGTM