Replace jest-axe with axe-core

[TylerJDev]

Closes https://github.com/github/primer/issues/3284

Changelog

Changed

• Removes jest-axe in favor of using axe-core
• Adds @github/axe-github
• Adds custom matcher toHaveNoViolations()

Removed

• Removes jest-axe
• Removes custom axe rule in favor of @github/axe-github

Rollout strategy

• Patch release
• Minor release
• Major release; if selected, include a written rollout or migration plan
• None; if selected, include a brief description as to why

Testing & Reviewing

Merge checklist

• Added/updated tests
• Added/updated documentation
• Added/updated previews (Storybook)
• Changes are SSR compatible
• Tested in Chrome
• Tested in Firefox
• Tested in Safari
• Tested in Edge
• (GitHub staff only) Integration tests pass at github/github (Learn more about how to run integration tests)

[changeset-bot]

⚠️ No Changeset found

Latest commit: f314fd8

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[github-actions]

size-limit report 📦

Path	Size
packages/react/dist/browser.esm.js	88.34 KB (0%)
packages/react/dist/browser.umd.js	88.65 KB (0%)

[joshblack]

Thanks for doing this! 🥳