feat(DatePicker): RangePicker support rootClassName

[kiner-tang]

[中文版模板 / Chinese template]

🤔 This is a ...

• New feature
• Bug fix
• Site / documentation update
• Demo update
• Component style update
• TypeScript definition update
• Bundle size optimization
• Performance optimization
• Enhancement feature
• Internationalization
• Refactoring
• Code style optimization
• Test Case
• Branch merge
• Workflow
• Other (about what?)

🔗 Related issue link

💡 Background and solution

📝 Changelog

Language	Changelog
🇺🇸 English	RangePicker support rootClassName
🇨🇳 Chinese	日期范围选择器支持 rootClassName

☑️ Self-Check before Merge

⚠️ Please check all items below before requesting a reviewing. ⚠️

• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• TypeScript definition is updated/provided or not needed
• Changelog is provided or not needed

---

🚀 Summary

🤖 Generated by Copilot at 0c0f90b

This pull request adds a new prop rootClassName to the RangePicker component, which allows users to customize the root class name of the date picker panel. It also updates the tests and the documentation for the new prop in both English and Chinese.

🔍 Walkthrough

🤖 Generated by Copilot at 0c0f90b

• Add rootClassName prop to RangePicker component to allow customizing the root element's class name (link, link, link, link, link)
• Pass rootClassName prop from RangePicker to Picker and PickerPanel components in generateRangePicker.tsx (link, link)
• Test rootClassName prop in RangePicker.test.tsx by checking the snapshot and the prop's value on the root element (link)

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[github-actions]

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size-limit report 📦

Path	Size
./dist/antd.min.js	386.66 KB (-2 B 🔽)
./dist/antd-with-locales.min.js	445.8 KB (+5 B 🔺)

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (6ca1b6d) 100.00% compared to head (aa76ed8) 100.00%.
Report is 29 commits behind head on feature.

Additional details and impacted files

@@            Coverage Diff            @@
##           feature    #44057   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          658       658           
  Lines        11166     11223   +57     
  Branches      3024      3047   +23     
=========================================
+ Hits         11166     11223   +57     

Files Changed	Coverage Δ
components/_util/wave/index.ts	100.00% <ø> (ø)
components/_util/wave/style.ts	100.00% <ø> (ø)
components/anchor/style/index.ts	100.00% <ø> (ø)
components/checkbox/style/index.ts	100.00% <ø> (ø)
components/config-provider/context.ts	100.00% <ø> (ø)
...ate-picker/generatePicker/generateSinglePicker.tsx	100.00% <ø> (ø)
components/drawer/style/index.ts	100.00% <ø> (ø)
components/input-number/style/index.ts	100.00% <ø> (ø)
components/input/style/index.ts	100.00% <ø> (ø)
components/table/style/rtl.ts	100.00% <ø> (ø)
... and 12 more

... and 2 files with indirect coverage changes

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