Remove variant prop from KeybindingHint Chord component

[langermank]

Closes https://github.com/github/primer/issues/6142

Removes the variant prop and replaces it with Tooltip specific CSS. Primary was handled previously.

Depends on https://github.com/github/github-ui/pull/7169 merging to unblock test failures.

Changelog

New

Changed

Removed

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]

🦋 Changeset detected

Latest commit: 9b11466

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@primer/react	Major
@primer/mcp	Patch

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[github-actions]

👋 Hi, this pull request contains changes to the source code that github/github-ui depends on. If you are GitHub staff, test these changes with github/github-ui using the integration workflow. Or, apply the integration-tests: skipped manually label to skip these checks.

[francinelucca]

Does this mean the "variant" prop in KeyBindingHint will be a no-op? Not sure we should remove this without a major 🤔

[langermank]

Yeah, I did add a major changeset as it is breaking. FWIW I'm removing calls from dotcom in this PR but probably safe to put this in the next major anyway! https://github.com/github/github-ui/pull/7169

[github-actions]

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