fix: only mock debug in production

[danielroe]

🔗 Linked issue

nuxt/nuxt#19236

❓ 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

This moves our mock for debug out of default settings and is now only applied in production mode.

📝 Checklist

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

[codecov]

Codecov Report

Merging #990 (dcfeec7) into main (5604ca3) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #990   +/-   ##
=======================================
  Coverage   67.79%   67.79%           
=======================================
  Files          60       60           
  Lines        6132     6133    +1     
  Branches      691      692    +1     
=======================================
+ Hits         4157     4158    +1     
  Misses       1966     1966           
  Partials        9        9           

Impacted Files	Coverage Δ
src/rollup/config.ts	88.32% <100.00%> (+0.02%)	⬆️

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