Fix focus management issue when updating folder tree children

[cm9361]

Summary

What was changed:
Fixed an issue where folder tree items could not receive focus after data was updated.

Why it was changed:
The change was made because consumers require the ability to update the data within the Folder Tree component. Accessibility should not be broken by this action.

Testing

This change was tested using:

• WDIO
• Jest
• Visual testing (please attach a screenshot or recording)
• Other (please describe below)
• No tests are needed

Reviews

In addition to engineering reviews, this PR needs:

• UX review
• Accessibility review
• Functional review

Additional Details

This PR resolves:

UXPLATFORM-10350

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@cerner/terra

[sycombs]

Code looks good to me. I noticed some unexpected behavior with the reload example though where prior to clicking the "Reload Data" button, the expand all button would expand all items as expected, but after clicking "Reload Data" it would no longer expand the items. Individually row expand/collapse works fine. Most likely the expanded items state needs to be updated when the data is reloaded as well.

[cm9361]

Code looks good to me. I noticed some unexpected behavior with the reload example though where prior to clicking the "Reload Data" button, the expand all button would expand all items as expected, but after clicking "Reload Data" it would no longer expand the items. Individually row expand/collapse works fine. Most likely the expanded items state needs to be updated when the data is reloaded as well.

I am pretty sure I got overzealous on the useCallback usage. I'll fix it.

[cm9361]

@sycombs - I fixed the test page issue.