[mnt] nipype conversion updates

[djarecka]

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

• adding generate_output_updates, to be able to predict names of the generated outputs before running

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)

Acknowledgment

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

[codecov]

Codecov Report

Merging #354 into master will decrease coverage by 0.17%.
The diff coverage is 61.53%.

@@            Coverage Diff             @@
##           master     #354      +/-   ##
==========================================
- Coverage   85.86%   85.69%   -0.18%     
==========================================
  Files          20       20              
  Lines        3736     3761      +25     
  Branches     1007     1016       +9     
==========================================
+ Hits         3208     3223      +15     
- Misses        334      339       +5     
- Partials      194      199       +5     

Flag	Coverage Δ
#unittests	85.69% <61.53%> (-0.18%)	⬇️

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

Impacted Files	Coverage Δ
pydra/engine/helpers_file.py	78.84% <ø> (ø)
pydra/engine/specs.py	86.92% <60.00%> (-1.19%)	⬇️
pydra/engine/core.py	88.10% <63.63%> (-0.48%)	⬇️

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