feat(Cascader): unified provision of custom prefixCls

[EmilyyyLiu]

统一添加自定义class 前缀
关联issue #6960

[gemini-code-assist]

Summary of Changes

Hello @EmilyyyLiu, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the Cascader component by introducing a unified mechanism for providing custom CSS class prefixes. This change allows for greater flexibility in styling and theme integration, enabling the component to seamlessly adapt to different design systems. It leverages the ConfigProvider for global prefix management while also offering a direct prop for component-specific overrides.

Highlights

• Custom Prefix Class Support: The Cascader component now supports a custom prefixCls prop, allowing developers to define a unique class prefix for its elements.
• ConfigProvider Integration: The Cascader component integrates with ConfigProvider to automatically inherit a global prefixCls if provided, ensuring consistent styling across applications.
• Prefix Class Prioritization: The component-level prefixCls prop takes precedence over the prefixCls provided by ConfigProvider, offering granular control when needed.
• Test Coverage: New test cases have been added to verify the correct application and prioritization of the prefixCls from both ConfigProvider and the component's own prop.

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[gemini-code-assist]

Code Review

这个 PR 很好地为 Cascader 组件统一了自定义 prefixCls 的功能，与库中其他组件的实现方式保持了一致。实现方式正确，并且添加了充分的测试用例。我只在测试文件中有一个关于代码清晰度的小建议。

[pkg-pr-new]

npm i https://pkg.pr.new/ant-design/ant-design-mobile/antd-mobile@6973

commit: 00955de

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.95%. Comparing base (bfde19d) to head (00955de).

Additional details and impacted files

@@           Coverage Diff            @@
##           feature    #6973   +/-   ##
========================================
  Coverage    92.95%   92.95%           
========================================
  Files          337      337           
  Lines         7368     7368           
  Branches      1871     1872    +1     
========================================
  Hits          6849     6849           
  Misses         483      483           
  Partials        36       36           

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