fix(tabs): focus state color when disabled

[hsuanxyz]

[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
• Refactoring
• Code style optimization
• Test Case
• Branch merge
• Other (about what?)

🔗 Related issue link

https://codesandbox.io/s/serene-wiles-gtu01

💡 Background and solution

📝 Changelog

Language	Changelog
🇺🇸 English	🐞 Fix tab focus state color when disabled
🇨🇳 Chinese	🐞 修复 tab 禁用时 focus 状态的颜色

☑️ 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

[ant-design-bot]

[ant-design-bot]

[codesandbox-ci]

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[MrHeer]

why not write after this line?

[hsuanxyz]

sorry, I'm not familiar with less, do you have any good suggestions for me?

like this? I think the readability is not good.

  &&-disabled {
      color: @disabled-color;
      cursor: not-allowed;
      
      .@{tab-prefix-cls}-tab-btn,
      .@{tab-prefix-cls}-tab--remove {
        &:focus,
        &:active {
          color: @disabled-color;
        }
      }
    }

[xrkffgg]

How about pointer-events: none?

[afc163]

/rebase

[codecov]

Codecov Report

Merging #25827 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #25827   +/-   ##
=======================================
  Coverage   99.52%   99.52%           
=======================================
  Files         374      374           
  Lines        7300     7300           
  Branches     2037     1989   -48     
=======================================
  Hits         7265     7265           
  Misses         35       35           

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