fix: Collapse border radius issue

[hamzaseif13]

中文版模板 / Chinese template

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🔗 Related issue link

💡 Background and solution

Collapse bottom border looks weird, the problem is the collapse parent component doesn't have a bottom border, and every collapse item has border bottom, making the border bottom looks weird and it has some white curved line, this can barely be visible unless zoomed a lot.
my fix is remove borderBottom:0 from parent component, and give borderBottom 0 to the last collapse-item.

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After

📝 Changelog

Language	Changelog
🇺🇸 English	Fix Collapse bottom border issue
🇨🇳 Chinese

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👁 Visual Regression Report for PR #48561 Failed ❌

🎯 Target branch: master (50d8201)
📖 View Full Report ↗︎

Expected (Branch master)	Actual (Current PR)	Diff
collapse-accordion.dark.png	collapse-accordion.dark.png
collapse-accordion.dark.png	collapse-accordion.dark.css-var.png
collapse-basic.dark.png	collapse-basic.dark.png
collapse-basic.dark.png	collapse-basic.dark.css-var.png
collapse-collapsible.dark.png	collapse-collapsible.dark.png
collapse-collapsible.dark.png	collapse-collapsible.dark.css-var.png
collapse-extra.dark.png	collapse-extra.dark.png
collapse-extra.dark.png	collapse-extra.dark.css-var.png
collapse-mix.dark.png	collapse-mix.dark.png
collapse-mix.dark.png	collapse-mix.dark.css-var.png

Check Full Report for details

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (50d8201) to head (5dfa8dc).

Additional details and impacted files

@@            Coverage Diff             @@
##            master    #48561    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files          745       745            
  Lines        13603     12947   -656     
  Branches      3628      3383   -245     
==========================================
- Hits         13603     12947   -656     

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