fix(S2): forward focus to textarea in FieldGroup

[tmvnkr]

Closes #9036

✅ 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:

Start the S2 Storybook and find the TextField > TextAreaExample story. Select false for the isInvalid control and click on the padding/non-interactive areas of the TextArea field group and verify that focus is forwarded to the textarea.

🧢 Your Project:

[reidbarber]

Good catch!