fix(schema): update vue-loader options type

[Lehoczky]

🔗 Linked issue

#21332

❓ Type of change

• 📖 Documentation (updates to the documentation, readme or JSdoc annotations)
• 🐞 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)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

The schema for the vue-loader options did not extend the VueLoaderOptions interface and therefore the generated type, which the defineNuxtConfig function used was incorrect.

There are probably issues with other properties of the webpack.loaders object as well. They most likely should extend the option interface of their webpack plugin too. I can try to address this in another PR if you want, Daniel.

Before:

After:

Resolves #21332

📝 Checklist

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