fix: Popover shift

[MadCcc]

[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

📝 Changelog

Language	Changelog
🇺🇸 English	Fix Popover that should shift automaticly when overflowed.
🇨🇳 Chinese	修复 Popover 超出屏幕时不会自动调整偏移的问题。

☑️ 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 7c15c97

This pull request enhances the popup positioning feature by allowing auto-adjustment of placements when the popup overflows the viewport. It also removes an unused demo file components/popover/demo/arrow-point-at-center.tsx.

🔍 Walkthrough

🤖 Generated by Copilot at 7c15c97

• Enable auto-adjusting placements for popups when they overflow the viewport by:
  • Shifting and adjusting the vertical position of the popup (link)
  • Shifting and adjusting the horizontal position of the popup (link)
• Delete the demo file arrow-point-at-center.tsx for popover component (link)

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[github-actions]

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size-limit report 📦

Path	Size
./dist/antd.min.js	394.12 KB (+13 B 🔺)
./dist/antd-with-locales.min.js	453.32 KB (+12 B 🔺)

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Build	Status	Details	Updated (UTC)
default (Inspect)	✅ No change detected	-	Sep 22, 2023, 5:58 AM

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (51fc8dc) 100.00% compared to head (df6fa0c) 100.00%.
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master    #45015   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          682       682           
  Lines        11524     11528    +4     
  Branches      3098      3098           
=========================================
+ Hits         11524     11528    +4     

Files Changed	Coverage Δ
components/_util/placements.ts	100.00% <100.00%> (ø)

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