fix: globalStyles being shaked when config some sideEffects

[Timeless0911]

Summary

In a module project, the sideEffects usually be

"sideEffects": [
  "**/*.css",
  "**/*.less",
  "**/*.sass",
  "**/*.scss"
],

when we use module doc plugin, it will build a web project, the sideEffects config will influence the tree-shaking behaviour of global styles virtual module, which caused some styles broken in the current version of rspress.

Related Issue

Checklist

• [ ] Tests updated (or not required).
• [ ] Documentation updated (or not required).

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