fix(nuxt): do not log 404 and showError as fatal by default

[pi0]

🔗 Linked issue

❓ 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 #4539 and unjs/h3#148 we introduced new fatal flag for error that are intended to be logged. 404 Page not found errors we throw are not fatal to be verbosely logged by h3.

Also with this change, showError by default does not set fatality of error but only mark there is an error and display it (locally testing works both when calling from client and server side).

Related: In future versions of h3, we might make createError smarter to infer fatal flag from known codes.

Appendix current output:

📝 Checklist

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

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