TreeView: Use roving tabIndex for focus management (#2443)

* Swap active descendant implementation for roving tabindex (wip)

Co-authored-by: Josh Black <[email protected]>

* Remove active descendant from loading focus logic

* Remove active descendant code and fix build errors

* Add typeahead

* Update level indicator line logic

* useActiveDescendant -> useRovingTabIndex

* Remove unnecessary styles

* Document ref props

* Forward ref to LinkItem

* Create wise-keys-drum.md

* Remove active descendant from tests

* Update toggle on enter

Co-authored-by: Josh Black <[email protected]>

Author: colebemis

.changeset/wise-keys-drum.md

@@ -0,0 +1,5 @@
+---
+"@primer/react": patch
+---
+
+TreeView: Use roving tabindex instead of `aria-activedescendant` for improved VoiceOver support in Safari

docs/content/TreeView.mdx

@@ -223,6 +223,7 @@ See [Storybook](https://primer.style/react/storybook?path=/story/components-tree
     name="onSelect"
     type="(event: React.MouseEvent<HTMLElement> | React.KeyboardEvent<HTMLElement>) => void"
   />
+  <PropsTableRefRow refType="HTMLElement" />
   {/* <PropsTableSxRow /> */}
 </PropsTable>
 
@@ -267,13 +268,10 @@ See [Storybook](https://primer.style/react/storybook?path=/story/components-tree
     name="onSelect"
     type="(event: React.MouseEvent<HTMLElement> | React.KeyboardEvent<HTMLElement>) => void"
   />
+  <PropsTableRefRow refType="HTMLElement" />
   {/* <PropsTableSxRow /> */}
 </PropsTable>
 
-### TreeView.LoadingItem
-
-<PropsTable>{/* <PropsTableSxRow /> */}</PropsTable>
-
 ### TreeView.SubTree
 
 <PropsTable>