ActionMenu: Fix missing divider for first item when the menu is open with mouse

[siddharthkp]

• Fixes [ActionList] showDividers bug #3461

Context:

• When you open ActionMenu with mouse click, we focus the first item by default (this matched a11y guidance at the time)
• In the past, we treated both focus and focus-visible the same and added a focus ring on the focused item
• To avoid both a divider and focus ring at the same time, we have some logic to hide divider if a surrounding item has focus or focus-visible
• In Remove incorrect focus styles on ActionList items #3056, we removed the focus ring on focus (keeping it only on focus-visible)
• Without matching divider logic, we end up with the divider hidden on focus even when there is no ring (reported in [ActionList] showDividers bug #3461)

This pull request fixes that by removing divider logic for focus (still keeping it for focus-visible)

Before	After

[changeset-bot]

🦋 Changeset detected

Latest commit: 4ec29ea

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@primer/react	Patch

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[github-actions]

size-limit report 📦

Path	Size
dist/browser.esm.js	101.8 KB (-0.01% 🔽)
dist/browser.umd.js	102.34 KB (-0.01% 🔽)

[broccolinisoup]

Looks great to me 🚀
Also, thanks so much for the context! I love how you wrote it like a story 🤗