fix(nuxt): call app:error in SSR before rendering error page

[danielroe]

🔗 Linked issue

resolves #20183
resolves #20113

❓ 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)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

This PR calls app:error when there's an error rendering to string and we'll directly return an error page. (Previously, it only caught fatal errors in Nuxt plugins.) That allows us to hook into this for setting cookies, for example, as well as to provide some consistency when handling errors with hooks registered in nuxt plugins, and so on.

The one downside is that fatal errors in Nuxt plugins will now result in two calls to app:error.

Alternatively, we could call app:rendered here - or add another hook (app:render:error?).

📝 Checklist

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

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