Fix escape key to close IME in useOverlay

[ryo-manba]

Closes #5921

✅ 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:

1. Open OS keyboard settings
2. Add Chinese Pinyin - Simplified
3. Visit http://localhost:9003/?path=/story/dialog--form&providerSwitcher-express=false&strict=true
4. Type "ni", a set of suggestions should appear
5. Press Tab 3x
6. Press Escape and see the state of the dialog

🧢 Your Project:

[LFDanLu]

GET_BUILD

[rspbot]

Build successful! 🎉

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

[rspbot]

## API Changes

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[LFDanLu]

Tested locally and confirmed that this works. For others who may test this, note that exiting the IME dropdown with ESC doesn't remove you from the composing state. You have to hit ESC again which will clear the field. This seems to be the correct behavior, I'm more used to the Windows IME dropdown which doesn't close until you hit ESC twice before closing the dropdown which then clears the field (first escape reverts to whatever raw input you had typed -> second clears and closes the dropdown) which is pretty much the same behavior except for when the dropdown closes