fix(worker): Prevent timeout on large validator output by waiting on process.communicate instead of exit

[nellh]

This simplifies running the schema validator, we wait on process.communicate instead of process exit before reading the stdout buffer. This avoids a deadlock where deno would wait for the buffer to be consumed before writing the rest of the output.

Fixes #3233

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 45.66%. Comparing base (4a5bf01) to head (ea5407e).
Report is 7 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3235   +/-   ##
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  Coverage   45.66%   45.66%           
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  Files         595      595           
  Lines       38013    38008    -5     
  Branches     1167     1167           
=======================================
- Hits        17357    17355    -2     
+ Misses      20459    20456    -3     
  Partials      197      197           

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[alessandra-rampinini]

Hi! The dataset for v1.0.2 at https://openneuro.org/datasets/ds005613/versions/1.0.2 still shows validation pending, while it shows 'valid' if I visualize the draft.
Draft (but lots of warnings not present before):

v1.0.2

Plus there are additional issues:

1. it shows a huge difference in size while I only updated the readme
   v1.0.2
   
   v1.0.1
   

2. it looks invalid from my dataset list:
   

EDIT:
3) randomly shows this upon opening v.1.0.2

I only corrected a typo in the readme for the publication between v.1.0.1 and v.1.0.2, so I'm wondering what is happening. Please feel free to move this conversation to a new issue if it does not belong to the original request anymore.
best,
alessandra