Merge DropdownMenu2 into ActionMenu2

[siddharthkp]

Following up on the proposal to simplify components based on ActionList: loom video

- <DropdownMenu>
-   <DropdownMenu.Button>toggle menu</DropdownMenu.Button>
-   <DropdownMenu.Overlay>
       <ActionList>...<ActionList>
-   </DropdownMenu.Overlay>
- <DropdownMenu>

+ <ActionMenu>
+   <ActionMenu.Button>toggle menu</ActionMenu.Button>
+   <ActionMenu.Overlay>
+     <ActionList selectionVariant="single">...<ActionList> // notice the selectionVariant here :)
+   </ActionMenu.Overlay>
+ <ActionMenu>

• Update components
• Update docs
• Update stories
• Update tests

Merge checklist

• Added/updated tests
• Added/updated documentation
• Tested in Chrome
• Tested in Firefox
• Tested in Safari
• Tested in Edge

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🦋 Changeset detected

Latest commit: 5654f8f

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

This PR includes changesets to release 1 package

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@primer/react	Patch

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[github-actions]

size-limit report 📦

Path	Size
dist/browser.esm.js	62.6 KB (0%)
dist/browser.umd.js	62.99 KB (0%)

[colebemis]

This API feels much nicer 💖

[siddharthkp]

Update: Whoops, can't delete DropdownMenu2 because memex already uses it: https://cs.github.com/?scopeName=All+repos&scope=&q=primer%2Freact%2Flib-esm%2Fdrafts+DropdownMenu

Going to keep that around until the big deprecation: https://github.com/github/primer/issues/716

[echarles]

Perfect timing for me to remove from my experiments the DropdownMenu2 and focus building on ActionMenu2.

[echarles]

@siddharthkp At the end of your loom, you refer to NavigationList. I have found this comment that says NavigationList should replace SideNav when ready. What are the plans for that NavigationList? Any way to already try it?