chore: Fix Form.List render logic

[zombieJ]

🤔 This is a ...

• New feature
• Bug fix
• Site / document update
• Component style update
• TypeScript definition update
• Refactoring
• Code style optimization
• Test Case
• Branch merge
• Other (about what?)

🔗 Related issue link

resolve #23978

💡 Background and solution

📝 Changelog

Language	Changelog
🇺🇸 English	Fix Form.List field status sync logic and add a nest fields demo.
🇨🇳 Chinese	修复 Form.List 字段状态同步逻辑并添加嵌套字段示例。

☑️ Self Check before Merge

⚠️ Please check all items below before review. ⚠️

• 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

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View rendered components/form/demo/dynamic-form-item.md
View rendered components/form/demo/dynamic-form-items.md

[ant-design-bot]

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[codecov]

Codecov Report

Merging #24009 into feature will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff            @@
##           feature   #24009   +/-   ##
========================================
  Coverage    98.75%   98.75%           
========================================
  Files          364      364           
  Lines         7297     7298    +1     
  Branches      2020     2021    +1     
========================================
+ Hits          7206     7207    +1     
  Misses          91       91           

Impacted Files	Coverage Δ
components/form/FormItem.tsx	99.15% <100.00%> (+<0.01%)	⬆️

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