fix: prevent form submission when required Select has more than 300 options and no selection

[lucasweng]

Closes #8034

✅ 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:

• Added a "Required Select With Many Items" story to RAC storybook to manually verify the behavior, since required select validation cannot currently be tested in the jsdom environment (see: http://github.com/jsdom/jsdom/issues/2898).

🧢 Your Project:

[snowystinger]

This appears to be working as intended. I tried looking into a unit test for it working around the issue in the comment, but I don't think it's worth the effort in jsdom. Instead, we can write a play function to do it in storybook in the future