fix(turbopack-css): ignore lightning-css global pseudo elements warning

[fireairforce]

for issue: utooland/utoo#2269

先暂时把 :global {} 以及 :global() 中的伪元素场景忽略掉，这里先做最小改动，后续遇到了更多的 unsupported 伪类元素再看情况处理。

[gemini-code-assist]

Summary of Changes

Hello @fireairforce, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request resolves an issue where the lightning-css parser was incorrectly flagging :global pseudo-classes as unsupported, leading to unnecessary warnings during CSS processing. The change introduces a precise mechanism to suppress these specific warnings, ensuring that CSS from preprocessors like LESS can be processed without generating irrelevant alerts, thereby improving the clarity of the build output.

Highlights

• CSS Warning Suppression: Added specific logic to ignore warnings generated by lightning-css when it encounters the :global pseudo-class, which is often used by CSS preprocessors.
• Targeted Fix: This change provides a minimal, targeted fix to address the immediate issue of :global pseudo-element warnings, with a plan to evaluate broader unsupported pseudo-element handling in the future.

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[gemini-code-assist]

Code Review

你好，感谢你的贡献！这个修复看起来是正确的，它通过忽略 lightningcss 产生的关于 :global 伪元素的警告，解决了问题。

我有一个关于代码风格和可读性的建议：可以将 if let 检查合并到 match 语句中，使错误处理逻辑更加集中和清晰。详细信息请看我的具体评论。

除此之外，代码改动很直接，解决了目标问题。