fix(Collapse): solve deprecated warning display unexpected in collapse issue

[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
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🔗 Related issue link

close #42873

💡 Background and solution

📝 Changelog

Language	Changelog
🇺🇸 English	solve deprecated warning display unexpected in collapse issue
🇨🇳 Chinese	解决折叠面板组件废弃警告异常显示问题

☑️ 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 6d0567e

Fixed a bug in the Collapse component that caused an empty array to be rendered when children was null. Added a test case for the new items prop feature and improved the code style of the test file.

🔍 Walkthrough

🤖 Generated by Copilot at 6d0567e

• Fix bug that rendered empty array when children was undefined or null in Collapse component (link)
• Add support for items prop in Collapse component as an alternative to children prop (link, link)
• Reorder imports in index.test.tsx file to follow alphabetical order of module names (link)

[github-actions]

[github-actions]

Pull reviewers stats

Stats of the last 30 days for ant-design:

	User	Total reviews	Time to review	Total comments
	afc163	97	1h 18m	84
	li-jia-nan	95	2h	82
	MadCcc	57	1d 22h 34m	125
	kiner-tang	52	20m	28
	yoyo837	33	42m	33
	zombieJ	30	2h 32m	25
	RedJue	10	3h 50m	15
	heiyu4585	2	30m	0
	RexSkz	2	48m	5
	BoyYangzai	2	17m	6
	PeachScript	1	29m	0
	vagusX	1	1h 36m	0
	Wxh16144	1	21m	3
	any1024	1	7h 10m	2
	sawadyecma	1	1h 51m	2
	bombillazo	1	23h 49m	1
	lke-twh	1	2h 49m	0

[github-actions]

size-limit report 📦

Path	Size
./dist/antd.min.js	375.84 KB (+4 B 🔺)
./dist/antd-with-locales.min.js	435.18 KB (+3 B 🔺)

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (d36e303) 100.00% compared to head (3554d27) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##            master    #42876   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          648       646    -2     
  Lines        10955     10927   -28     
  Branches      2974      2967    -7     
=========================================
- Hits         10955     10927   -28     

Impacted Files	Coverage Δ
components/collapse/Collapse.tsx	100.00% <100.00%> (ø)

... and 3 files with indirect coverage changes

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