Revert "broken symlink as an input the ShellTask"

[nicolocin]

Reverts #3 - messed up local git, will add later

[codecov]

Codecov Report

Merging #4 into skip_symlink_hash will decrease coverage by 0.40%.
The diff coverage is 100.00%.

@@                  Coverage Diff                  @@
##           skip_symlink_hash       #4      +/-   ##
=====================================================
- Coverage              86.95%   86.54%   -0.41%     
=====================================================
  Files                     20       20              
  Lines                   3349     3352       +3     
  Branches                 891      891              
=====================================================
- Hits                    2912     2901      -11     
- Misses                   272      287      +15     
+ Partials                 165      164       -1     

Flag	Coverage Δ
#unittests	86.54% <100.00%> (-0.41%)	⬇️

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Impacted Files	Coverage Δ
pydra/engine/helpers.py	86.50% <100.00%> (+0.34%)	⬆️
pydra/engine/helpers_file.py	85.29% <100.00%> (+5.29%)	⬆️
pydra/conftest.py	77.77% <0.00%> (-22.23%)	⬇️
pydra/engine/workers.py	77.61% <0.00%> (-6.97%)	⬇️
pydra/utils/profiler.py	38.16% <0.00%> (-5.35%)	⬇️
pydra/engine/submitter.py	90.51% <0.00%> (-1.46%)	⬇️

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