Add scrollbar-gutter prop to PageLayoutPane

[dipree]

Without scrollbar-gutter (or set to auto)

CleanShot.2024-05-15.at.08.33.07.mp4

Set to scrollbar-gutter: stable

CleanShot.2024-05-15.at.08.34.27.mp4

https://developer.mozilla.org/en-US/docs/Web/CSS/scrollbar-gutter

Changelog

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• 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: 70ef9ac

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[github-actions]

size-limit report 📦

Path	Size
packages/react/dist/browser.esm.js	88.36 KB (+0.02% 🔺)
packages/react/dist/browser.umd.js	88.6 KB (-0.05% 🔽)

[siddharthkp]

When would we want this not to be stable?