style: Alert background could be linear-gradient

[afc163]

[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
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• Workflow
• Other (about what?)

🔗 Related issue link

💡 Background and solution

📝 Changelog

Language	Changelog
🇺🇸 English	Alert could support linear-gradient background by colorInfoBg token.
🇨🇳 Chinese	Alert 的背景色现在可以通过 colorInfoBg token 定义为渐变色。

☑️ 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

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[github-actions]

[github-actions]

size-limit report 📦

Path	Size
./dist/antd.min.js	324.72 KB (+3 B 🔺)
./dist/antd-with-locales.min.js	370.71 KB (+70 B 🔺)

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Build	Status	Details	Updated (UTC)
default (Inspect)	✅ No change detected	-	Nov 30, 2023, 7:49 AM

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (1235d8f) 100.00% compared to head (02ead97) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##            master    #46188   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files          701       701           
  Lines        11874     11874           
  Branches      3161      3161           
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  Hits         11874     11874           

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[MadCcc]

这么酷的吗

[github-actions]

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[zombieJ]

花里胡哨，我喜欢

[crazyair]

等其他组件改了 background 是不是都会变成渐变色了

[crazyair]

哦 这里只包了一个 Alert，一个组件也要用 ConfigProvider 配置吗，不能在 Alert 配置吗

[afc163]

组件上现在还没有 theme 属性。