Fix drag preview not displaying text in TableView

[ryo-manba]

Closes #4895

The fix ensures that when rowHeader is not present, the drag preview displays the content of the first element, excluding checkboxes and dragButtons.

✅ 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. Visit http://localhost:9003/?path=/story/tableview-drag-and-drop--drag-out-of-table-without-table-header&args=selectionStyle:highlight&providerSwitcher-express=false&strict=true
2. In the Table, drag a row.
3. Verify that the text from the first column ("First name") of the dragged row is displayed in the drag preview.

🧢 Your Project:

[snowystinger]

GET_BUILD

[haevensk]

Covers all test cases and complies with best practice ⭐ Great job on this @ryo-manba

[rspbot]

Build successful! 🎉

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

[rspbot]

## API Changes

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[snowystinger]

thanks for the fix!

[reidbarber]

LGTM, thanks!