Show rich tracebacks for errors in subprocesses.

[tobiasraabe]

Closes pytask-dev/pytask#126.

[codecov]

Codecov Report

Merging #27 (095d500) into main (f5624bd) will increase coverage by 0.30%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #27      +/-   ##
==========================================
+ Coverage   96.86%   97.17%   +0.30%     
==========================================
  Files          13       13              
  Lines         319      354      +35     
==========================================
+ Hits          309      344      +35     
  Misses         10       10              

Flag	Coverage Δ
end_to_end	90.39% <97.72%> (+1.05%)	⬆️
integration	48.87% <38.63%> (-1.29%)	⬇️
unit	51.12% <27.27%> (-2.17%)	⬇️

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Impacted Files	Coverage Δ
src/pytask_parallel/execute.py	92.07% <100.00%> (+2.07%)	⬆️
tests/test_execute.py	100.00% <100.00%> (ø)

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