feat(PointerBox): Convert PointerBox to CSS modules behind team feature flag

[TylerJDev]

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• Patch release
• Minor release
• Major release; if selected, include a written rollout or migration plan
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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]

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Latest commit: a833e24

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[github-actions]

👋 Hi, this pull request contains changes to the source code that github/github depends on. If you are GitHub staff, we recommend testing these changes with github/github using the integration workflow. Thanks!

[github-actions]

size-limit report 📦

Path	Size
packages/react/dist/browser.esm.js	102.59 KB (+0.1% 🔺)
packages/react/dist/browser.umd.js	102.93 KB (+0.09% 🔺)

[primer-integration]

👋 Hi from github/github! Your integration PR is ready: https://github.com/github/github/pull/352677

[primer-integration]

🔴 golden-jobs completed with status failure.