ci: adds a11y testing package, runner, and gh action #2812
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Summary
Adds Playwright for accessibility testing (per Storybook's official guidance) to our PR build checks, helping avoid introducing any new a11y issues.
Related Issues or PRs
Would help us avoid most future a11yRelates to accessibility standards and practices
tagged issues
How To Test
Run
yarn test-storybook
See that it currently fails 322 of 553 tests 😮💨
Screenshots (optional)