feat: TreeSelect support customize clearIcon

[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

• 📝 [RFC] Unify allowClear api for clearable component #43582
  close Allow Custom Clear Icon for DatePicker, Input.Password and TreeSelect #43495

💡 Background and solution

📝 Changelog

Language	Changelog
🇺🇸 English	TreeSelect support customize clear button
🇨🇳 Chinese	树选择组件支持自定义清除按钮

☑️ 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 eb5afcc

Enhanced the allowClear property of the TreeSelect component to support custom clear icons. Updated the English and Chinese documentation files index.en-US.md and index.zh-CN.md accordingly.

🔍 Walkthrough

🤖 Generated by Copilot at eb5afcc

• Enhance allowClear property of TreeSelect component to accept object type with clearIcon property for customizing clear icon (link, link)

[stackblitz]

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[github-actions]

[github-actions]

size-limit report 📦

Path	Size
./dist/antd.min.js	383.45 KB
./dist/antd-with-locales.min.js	442.96 KB

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (4858e60) 100.00% compared to head (eb5afcc) 100.00%.
Report is 3 commits behind head on feature.

Additional details and impacted files

@@            Coverage Diff            @@
##           feature    #43842   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          658       658           
  Lines        11118     11143   +25     
  Branches      3009      3017    +8     
=========================================
+ Hits         11118     11143   +25     

Files Changed	Coverage Δ
components/config-provider/context.ts	100.00% <ø> (ø)
components/config-provider/hooks/useTheme.ts	100.00% <100.00%> (ø)
components/config-provider/index.tsx	100.00% <100.00%> (ø)
components/theme/context.ts	100.00% <100.00%> (ø)
components/theme/useToken.ts	100.00% <100.00%> (ø)

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