WIP: fix(DnD): avoid unnecessary re-renders when drag modality changes.

[reidbarber]

Closes #2504

Related #2403

Adds useDynamicDescription, an alternative to useDescription that reuses the description node and id to avoid excessive re-renders when the description text changes. Fixes the issue where changing drag modality causes all the drop targets on a page to re-render.

TODO: might need a mechanism to ensure shared elements aren't changed when another consumer still relies on the old text (not an issue for modality change, but might come up somewhere else).

TODO: Investigate why some tests are failing only in React 18

✅ Pull Request Checklist:

• Included link to corresponding React Spectrum GitHub Issue.
• Added/updated unit tests and storybook for this change (for new code or code which already has tests).
• Filled out test instructions.
• Updated documentation (if it already exists for this component).
• Looked at the Accessibility Practices for this feature - Aria Practices

📝 Test Instructions:

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