fix: fix Steps size small of CP

[wanghui2021]

[中文版模板 / Chinese template]

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🔗 Related issue link

💡 Background and solution

📝 Changelog

Language	Changelog
🇺🇸 English	Fix ConfigProvider size prop not work on Steps.
🇨🇳 Chinese	修复 ConfigProvider size 对 Steps 无效的问题。

☑️ Self-Check before Merge

⚠️ Please check all items below before requesting a reviewing. ⚠️

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🚀 Summary

🤖 Generated by Copilot at 7c2ed5e

Refactored Steps component to use useSize hook and added a test case for size inheritance from ConfigProvider. Renamed size prop to customizeSize for clarity.

🔍 Walkthrough

🤖 Generated by Copilot at 7c2ed5e

• Rename size prop to customizeSize and use useSize hook to get the component size from global configuration or prop (link, link, link)
• Add a test case to verify that Steps component inherits the size from ConfigProvider (link, link)

[github-actions]

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (e036396) 100.00% compared to head (b9cf7c4) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##            master    #42278   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          619       619           
  Lines        10547     10548    +1     
  Branches      2881      2881           
=========================================
+ Hits         10547     10548    +1     

Impacted Files	Coverage Δ
components/steps/index.tsx	100.00% <100.00%> (ø)

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