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

[lucasweng]

Closes https://github.com/adobe/react-spectrum/issues/8034

✅ Pull Request Checklist:

• [x] Included link to corresponding React Spectrum GitHub Issue.
• [x] Added/updated unit tests and storybook for this change (for new code or code which already has tests).
• [x] Filled out test instructions.
• [x] Updated documentation (if it already exists for this component).
• [x] 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).

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