fix(prerender): call prerender:route before freeing up memory

[pi0]

🔗 Linked issue

❓ 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

With #1536, we are freeing up route contents from memory but this was causing prender:route to lose access to the route contents.

This PR fixes this by fixing the ordering and calling the hook directly inside generateRoute before freeing up memory and also simplifying the code. (previously we were wrongly catching unhandled internal errors as route errors now it uses simple console log to only avoid hiding edge cases with internal nitro bugs)

📝 Checklist

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

[codecov]

Codecov Report

Merging #1537 (4c0fed3) into main (2adeebb) will decrease coverage by 0.05%.
The diff coverage is 93.33%.

❗ Current head 4c0fed3 differs from pull request most recent head ec0631a. Consider uploading reports for the commit ec0631a to get more accurate results

@@            Coverage Diff             @@
##             main    #1537      +/-   ##
==========================================
- Coverage   76.15%   76.10%   -0.05%     
==========================================
  Files          73       73              
  Lines        7494     7491       -3     
  Branches      733      730       -3     
==========================================
- Hits         5707     5701       -6     
- Misses       1786     1788       +2     
- Partials        1        2       +1     

Files Changed	Coverage Δ
src/prerender.ts	84.94% <93.33%> (+0.13%)	⬆️

... and 1 file with indirect coverage changes