adding full traceback to the error files

[djarecka]

Acknowledgment

• I acknowledge that this contribution will be available under the Apache 2 license.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Summary

• checking error tracebacks in the _run methods and saving it to the error file
• adding info about the specific task's error file for wf error message
• adding tests

Checklist

• All tests passing
• I have added tests to cover my changes
• I have updated documentation (if necessary)
• My code follows the code style of this project
  (we are using black: you can pip install pre-commit,
  run pre-commit install in the pydra directory
  and black will be run automatically with each commit)

[codecov]

Codecov Report

Merging #430 (fe99b90) into master (d730edf) will increase coverage by 0.06%.
The diff coverage is 81.81%.

@@            Coverage Diff             @@
##           master     #430      +/-   ##
==========================================
+ Coverage   82.33%   82.40%   +0.06%     
==========================================
  Files          19       20       +1     
  Lines        3832     3858      +26     
  Branches     1046     1049       +3     
==========================================
+ Hits         3155     3179      +24     
  Misses        487      487              
- Partials      190      192       +2     

Flag	Coverage Δ
unittests	82.32% <81.81%> (+0.06%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pydra/engine/helpers.py	78.58% <0.00%> (-0.20%)	⬇️
pydra/engine/core.py	88.22% <100.00%> (+0.09%)	⬆️
pydra/__init__.py	95.00% <0.00%> (ø)

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[djarecka]

anyone knows how to fix the test so it works in windows?
edited:
done