feat: support the ability to remove inline padding

[maraisr]

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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	105.6 KB (+0.04% 🔺)
packages/react/dist/browser.umd.js	106.03 KB (+0.1% 🔺)

[langermank]

Suggested change

	noInlineGap?: boolean
	flush?: boolean

Would you mind renaming this prop to flush to match a similar implementation over in ActionBar?

[langermank]

Heads up that we're about to remove the CSS Modules feature flag from UnderlinePanel early next week. I would hold off on this until that merges so that you don't need to extend this behavior to sx