TreeView: Fix failing `TreeView` tests

[TylerJDev]

Summary

We have a handful of tests in TreeView.test.tsx that are failing. This is likely caused by the usage of userEvent through Vitest. We temporarily skipped the failing tests, but we should investigate why they were failing to begin with.

Additional context

Only tests that utilize userEvent fail. This isn't exclusive to userEvent, as we use it in other tests, such as AnchoredOverlay.

Here's a comparison of usage between components that use userEvent through Vitest:

Pattern	TreeView	AnchoredOverlay	Tabs	TopicTag
Wraps userEvent in act()	Yes	Yes	Yes	No
Uses userEvent.setup()	Yes	No (direct calls)	Yes	No (direct calls)
Uses fireEvent alongside	Yes (extensively)	No	Minimally	No
Fake timers	Yes	No	No	No
renderWithTheme wrapper	Yes (no-op)	No	No	No
Mocks (scrollIntoView)	Yes	No	No	No