Remove support for sx from PointerBox component

[llastflowers]

Closes https://github.com/github/primer/issues/5798

Current sx usage: 0

✅ Don't need to separately update github-ui components to use @primer/styled-react

Changelog

Removed

Remove support for sx from the PointerBox component, and any associated stories, docs, and tests

Rollout strategy

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

This component currently has 0 sx usage in dotcom, and therefore does not need the @primer/styled-react wrapper. this will be confirmed again before merging.

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: 89d50a4

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/styled-react	Major

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

[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	89.91 KB (-0.04% 🔽)
packages/react/dist/browser.umd.js	89.99 KB (-0.14% 🔽)