refactor(Label): Refactor Label component to use CSS modules behind feature flag

[jonrohan]

Part of https://github.com/github/primer/issues/3914

Changelog

Changed

Label refactored to use CSS modules behind the feature flag primer_react_css_modules_team

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

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: 81e9f2b

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

This PR includes changesets to release 1 package

Name	Type
@primer/react	Minor

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[github-actions]

size-limit report 📦

Path	Size
packages/react/dist/browser.esm.js	96.54 KB (+0.14% 🔺)
packages/react/dist/browser.umd.js	96.82 KB (+0.17% 🔺)

[langermank]

Nice 🔥 snapshot updates look good