test(modal): add keyboard navigation e2e tests

[tay1orjones]

Part of #13747

Thanks for pairing up on this @andreancardona!

Changelog

New

• Broke @avt tests out into their own Modal-test.avt.e2e.js file
  • @vrt tests remain in the Modal-test.e2e.js file
• Add keyboard navigation tests covering flows for default, danger, and passive modals

Changed

• Update playwright config glob to match and include the new test file naming structure (avt.e2e.js)
  • This is a duplicate change present also in test(uishell): add complex states avt coverage and keyboard navigation tests #14045 but I wanted to avoid branching off a branch

Testing / Reviewing

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

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[francinelucca]

looks like some extra configurations might be needed here @tay1orjones @andreancardona ? VRT CI is saying no tests found

[andreancardona]

looks like some extra configurations might be needed here @tay1orjones @andreancardona ? VRT CI is saying no tests found

will look into now :)

[francinelucca]

LGTM!

[tw15egan]

Looks great!