fix(cloudflare-pages): exclude assets from function call

[danielroe]

🔗 Linked issue

#497

❓ 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

We can generate a _routes.json file to prevent hits on assets directories from hitting the function at all. We might also be able to add individual assets that are outside of these directories to the json but this runs the risk of hitting the 100 rule limit. (Maybe we can allow extending the default config, suggested by @ColonelBundy.)

📝 Checklist

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

[codecov]

Codecov Report

Merging #965 (92e106d) into main (b11a0c4) will increase coverage by 0.19%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #965      +/-   ##
==========================================
+ Coverage   67.59%   67.78%   +0.19%     
==========================================
  Files          59       60       +1     
  Lines        6030     6128      +98     
  Branches      679      689      +10     
==========================================
+ Hits         4076     4154      +78     
- Misses       1945     1965      +20     
  Partials        9        9              

Impacted Files	Coverage Δ
src/presets/cloudflare.ts	88.03% <100.00%> (+25.73%)	⬆️
src/rollup/plugins/externals.ts	94.31% <0.00%> (-0.02%)	⬇️
src/presets/index.ts	100.00% <0.00%> (ø)
src/presets/lagon.ts	30.95% <0.00%> (ø)

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[pi0]

Thanks.