1518 react treeview feedback from screen reader

[agreenberry]

Describe your changes here.

Closes1518 as somewhat of a bandaid for the issue. The reason this is happening is from a larger issue with the api. For now, the aria message is now updating the status correctly based on which branch is expanded.

Screenshots

Please provide before/after screenshots for any visual changes
Before:

Directory with async items is expanded, but the status reads that that the last child, Nested Directory is empty. This is both not true, and irrelevant to expanding Directory with async items

After:

Now when Directory with async items is expanded, the status accurately reads that it has loaded.

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-bot]

🦋 Changeset detected

Latest commit: 84825f0

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	89.01 KB (0%)
dist/browser.umd.js	89.62 KB (0%)

[colebemis]

The reason this is happening is from a larger issue with the API.

Could you expand on this? What do you think the root cause of this issue is?

[colebemis]

Thanks for walking me through these changes, @green6erry! Looks good to me. Just left a small suggestion about adding a code comment to explain isPending.