test: add tests for dev server and proxy

[manniL]

🔗 Linked issue

#641 - not resolving though

❓ 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

Initial plan was to check why the proxy is failing. In the local setup, the proxy did not fail.
I've added some test for the proxy and for the dev preset in general to ensure

📝 Checklist

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

[codecov]

Codecov Report

Merging #644 (ec0d4c4) into main (6541373) will increase coverage by 3.52%.
The diff coverage is n/a.

❗ Current head ec0d4c4 differs from pull request most recent head 6388149. Consider uploading reports for the commit 6388149 to get more accurate results

@@            Coverage Diff             @@
##             main     #644      +/-   ##
==========================================
+ Coverage   68.53%   72.05%   +3.52%     
==========================================
  Files          57       57              
  Lines        5050     5050              
  Branches      497      548      +51     
==========================================
+ Hits         3461     3639     +178     
+ Misses       1582     1401     -181     
- Partials        7       10       +3     

Impacted Files	Coverage Δ
src/dev/vfs.ts	9.27% <0.00%> (+2.06%)	⬆️
src/options.ts	86.95% <0.00%> (+2.79%)	⬆️
src/build.ts	49.70% <0.00%> (+15.20%)	⬆️
src/dev/server.ts	72.31% <0.00%> (+47.52%)	⬆️

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[manniL]

LGTM now from my side, thanks for the input 👍🏻

[pi0]

Thanks!