fix(webpack): don't parse styles for composable keys

[danielroe]

🔗 Linked issue

resolves nuxt/nuxt#14834

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

With webpack, we have some code in a string in the style block, e.g.:

const code = ["\\nconst a ..."]

This wrongly gets parsed by the composable keys, and \\n breaks the parser.

But we shouldn't be parsing code from a style block for automatic useFetch/useState keys, anyway.

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

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