fix: ConfigProvider merge form validateMessages not inheriting from parent bug

[Wxh16144]

[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

fix: #43210

💡 Background and solution

#40533 Bug caused by commit

Example Code

import React from 'react';
import { Button, ConfigProvider, Form, Input } from 'antd';

const MyCustomForm = () => (
  <Form>
    <Form.Item name="name" label="Name" rules={[{ required: true }]}>
      <Input />
    </Form.Item>
    <Button type="primary" htmlType="submit">Submit</Button>
  </Form>
)

export default () => (
  <ConfigProvider>
    <MyCustomForm />
    <ConfigProvider form={{ validateMessages: { required: '必填' } }}>
      <MyCustomForm />
      <ConfigProvider>
        <MyCustomForm />
      </ConfigProvider>
    </ConfigProvider>
  </ConfigProvider>
);

Before

After

📝 Changelog

Language	Changelog
🇺🇸 English	Fixed nested ConfigProvider will miss form.validateMessages config.
🇨🇳 Chinese	修复 ConfigProvider 嵌套使用时，form.validateMessages 配置会丢失的问题。

☑️ 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 afb445b

This pull request adds a feature to customize the validation messages of the Form component using the validateMessages prop of the ConfigProvider component. It also fixes a bug related to nested ConfigProvider and Form components, and adds a test case to verify the functionality.

🔍 Walkthrough

🤖 Generated by Copilot at afb445b

• Add the validateMessages prop to the ConfigProvider component and its context, to allow customizing the error messages of nested Form components (link, link, link).

[github-actions]

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (41fe4ce) 100.00% compared to head (afb445b) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##            master    #43239   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          648       648           
  Lines        10965     10966    +1     
  Branches      2978      2979    +1     
=========================================
+ Hits         10965     10966    +1     

Impacted Files	Coverage Δ
components/config-provider/context.ts	100.00% <ø> (ø)
components/config-provider/index.tsx	100.00% <100.00%> (ø)

☔ View full report in Codecov by Sentry.
📢 Do you have feedback about the report comment? Let us know in this issue.

[afc163]

修复未合并父级 Form validateMessages 错误

changelog 写用户面对的问题，不只写解法。

[yoyo837]

v4是照搬的, 是否有类似问题?