fix: update expand hover behaviors

[snowystinger]

Closes

Discussed in slack, this gets rid of the full row hover behavior when disabledBehavior is selection and there is no onAction. Instead it adds a hover style to the expand button directly

✅ 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:

🧢 Your Project:

[rspbot]

Build successful! 🎉

• View the storybook
• View the S2 storybook
• View the S2 docs
• View the React Aria docs

[LFDanLu]

the change in color when hovered feels almost indistinguishable to me in light mode haha. Definitely much more noticeable in dark mode. Same with Tree