feat: Transfer support custom dropdown Icon

[li-jia-nan]

[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

• Add a prop to the Transfer component to allow for a custom icon for the dropdown in the title #43770

📝 Changelog

Language	Changelog
🇺🇸 English	feat: Transfer support custom dropdown Icon
🇨🇳 Chinese	Transfer 组件支持自定义 dropdown 下拉图标

☑️ 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 8964f93

This pull request adds a new feature to the Transfer component, which lets users customize the icon of the dropdown menu in the transfer list. It modifies the TransferList component, the TypeScript definition file, and the API documentation in both English and Chinese.

🔍 Walkthrough

🤖 Generated by Copilot at 8964f93

• Add dropdownIcon property to Transfer and TransferList components to allow customizing the dropdown icon of the transfer list header (link, link, link, link, link, link, link, link, link)
• Define isValidIcon function in list.tsx to check if a given icon is valid for rendering (link)

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[github-actions]

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size-limit report 📦

Path	Size
./dist/antd.min.js	382.6 KB (+11 B 🔺)
./dist/antd-with-locales.min.js	442.15 KB (+13 B 🔺)

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Build	Status	Details	Updated (UTC)
default (Inspect)	👍 Changes approved	3 changes	Jul 25, 2023, 4:41 AM

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (b4035b0) 100.00% compared to head (223c2ae) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##           feature    #43773   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          658       658           
  Lines        11110     11112    +2     
  Branches      3006      3007    +1     
=========================================
+ Hits         11110     11112    +2     

Files Changed	Coverage Δ
components/transfer/index.tsx	100.00% <ø> (ø)
components/transfer/list.tsx	100.00% <100.00%> (ø)

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