Add status code for upload errors

[arunoda]

This allow us to identify the root cause for the upload problem.

[codecov-io]

Codecov Report

Merging #2733 into canary will increase coverage by 0.04%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           canary    #2733      +/-   ##
==========================================
+ Coverage   13.57%   13.61%   +0.04%     
==========================================
  Files         261      261              
  Lines       10536    10568      +32     
  Branches     1356     1357       +1     
==========================================
+ Hits         1430     1439       +9     
- Misses       8961     8984      +23     
  Partials      145      145

Impacted Files	Coverage Δ
src/util/index.js	0% <0%> (ø)	⬆️
src/util/dev/router.ts	78.57% <0%> (-4.77%)	⬇️
src/util/dev/yarn-installer.ts	80.95% <0%> (-3.8%)	⬇️
src/util/output/create-output.ts	37.5% <0%> (-3.41%)	⬇️
src/util/dev/builder-cache.ts	69.84% <0%> (-1.36%)	⬇️
src/util/dev/builder.ts	72.1% <0%> (-1.02%)	⬇️
src/util/get-files.ts	90.1% <0%> (-0.91%)	⬇️
src/util/dev/server.ts	61.22% <0%> (-0.07%)	⬇️

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[arunoda]

Thanks @AndyBitz