docs: Toast/TabsPicker docs fixes, prevent Autocomplete input focus on mobile

[LFDanLu]

Closes #8160

Also fixes the following:

• RAC toast docs should work regardless if the user is on the vanilla CSS example or Tailwind example
• Necessity asterix from setting isRequired should only include the additional announcing for CheckboxGroup and Picker. Otherwise, the icon should be aria-hidden since the field already has been marked as required
• Apply a default className of "" to S2 Tabs' picker that appears when there are too many tabs to render at once. This prevents styles applied to the default RAC Select class name from affecting the S2 Tabs' picker. This makes the FileTabs in the CodeBlock in the new docs render with the proper picker underline width instead of always being 200px

✅ 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:

See the above, and also test that the autocomplete input field doesn't get automatically focused when tapping on a wrapped collection's item/row on mobile.

🧢 Your Project:

RSP

[rspbot]

Build successful! 🎉

• View the storybook
• View the S2 storybook
• View the documentation
• View the S2 docs

[rspbot]

Build successful! 🎉

• View the storybook
• View the S2 storybook
• View the documentation
• View the S2 docs