ActionBar: Ensure overflow menu only exists if there is no space

[TylerJDev]

Closes https://github.com/github/primer/issues/4584

Fixed behavior:

Screen.Recording.2024-12-23.at.7.36.19.PM.mov

Video description

Video showing ActionBar at different resize points. When the small screen size is shown, the overflow menu in ActionBar appears. When at a medium screen size, the overflow menu is hidden and all menu items are present.

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• Added/updated tests
• Added/updated documentation
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• Changes are SSR compatible
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Latest commit: 415b888

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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	103.73 KB (-0.04% 🔽)
packages/react/dist/browser.umd.js	104.1 KB (+0.01% 🔺)