Add ResizeObserver that observes targetRef (useOverlayPosition)

[sookmax]

Closes #6383

✅ 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:

Story

• http://localhost:9003/?path=/story/react-aria-components--popover-trigger-observer-example

Screen.Recording.2024-05-16.at.11.12.11.PM.mov

🧢 Your Project:

[snowystinger]

GET_BUILD

[rspbot]

Build successful! 🎉

• View the storybook
• View the storybook-canary
• View the storybook-17
• View the storybook-16
• View the documentation

[rspbot]

## API Changes

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[LFDanLu]

LGTM, verified that the popover flips/resizes properly in the story with change and doesn't without.