test(uishell): add complex states avt coverage and keyboard navigation tests

[tay1orjones]

Part of #13747

Thanks for pairing up on this @andreancardona!

Changelog

New

• Broke @avt tests out into their own UIShell-test.avt.e2e.js file
  • @vrt tests remain in the UIShell-test.e2e.js file
  • One side benefit of this approach to break tests out into separate files is that these can be spread out across many workers in CI. This should help avoid any increases to the time it takes to complete the e2e test suite as we add these additional tests across many components.
• Added new tests for complex/problematic states
• Added a new test for keyboard navigation of UIShell

Changed

• Update playwright config glob to match and include the new test file naming structure (avt.e2e.js)

Testing / Reviewing

• CI should pass
• Ensure the tests pass a sniff test and don't look problematic

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[guidari]

LGTM!! The tests are passing