Only show tooltip on :focus-visible, not :focus

[siddharthkp]

• Closes https://github.com/github/primer/issues/2926

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[github-actions]

size-limit report 📦

Path	Size
dist/browser.esm.js	104.97 KB (+0.02% 🔺)
dist/browser.umd.js	105.55 KB (+0.03% 🔺)

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[siddharthkp]

• Part of IconButton: introduce tooltips on icon buttons behind the unsafeDisableTooltip prop for an incremental rollout #4224 now