fix: allow tree-shake glob eager css in js

[sapphi-red]

Description

Make it possible to tree-shake the value when all value of glob-eager are not used.

close #9537

Additional context

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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[patak-dev]

This is an interesting effect of #3682. I wonder if there is a better way to avoid Object.assign now that you found out we also need __PURE__ for it. For now, let's merge this, I consider it a fix more than a feat.