docs: remove duplicate implementation code in useDatePicker and useDateRangePicker

[reidbarber]

Cleans up duplicate implementation code in useDatePicker and useDateRangePicker (already rendered in tabs).

✅ 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 docs.

🧢 Your Project:

[rspbot]

Build successful! 🎉

• View the storybook
• View the S2 storybook
• View the S2 docs
• View the React Aria docs

[rspbot]

Agent Skills Changes

Modified (6)

• react-aria/skills/react-aria/references/components/DatePicker/useDatePicker.md $\color{red}{-67}$
• react-aria/skills/react-aria/references/components/DateRangePicker/useDateRangePicker.md $\color{red}{-78}$
• react-aria/skills/react-aria/references/components/Separator/useSeparator.md $\color{green}{+1}$ $\color{red}{-1}$
• s2/skills/react-spectrum-s2/references/react-aria/components/DatePicker/useDatePicker.md $\color{red}{-67}$
• s2/skills/react-spectrum-s2/references/react-aria/components/DateRangePicker/useDateRangePicker.md $\color{red}{-78}$
• s2/skills/react-spectrum-s2/references/react-aria/components/Separator/useSeparator.md $\color{green}{+1}$ $\color{red}{-1}$

Install

React Spectrum S2:

npx skills add https://d1pzu54gtk2aed.cloudfront.net/pr/62680a4b1a2c4977994b18197a1420f5e86461e4/

React Aria:

npx skills add https://d5iwopk28bdhl.cloudfront.net/pr/62680a4b1a2c4977994b18197a1420f5e86461e4/