Graph test

[djarecka]

Summary

• adding test for plotting graph for workflow when workflow has a splitter (test for changes from use cache_dir instead of output_dir #538)
• small fix of Docker/Singularity tasks: name=None in init
• marking one test as flaky for slurm

Checklist

• I have added tests to cover my changes (if necessary)
• I have updated documentation (if necessary)

[codecov]

Codecov Report

Base: 76.82% // Head: 76.82% // No change to project coverage 👍

Coverage data is based on head (986d539) compared to base (a9ef35f).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #603   +/-   ##
=======================================
  Coverage   76.82%   76.82%           
=======================================
  Files          19       19           
  Lines        4358     4358           
  Branches     1258     1258           
=======================================
  Hits         3348     3348           
  Misses        821      821           
  Partials      189      189           

Flag	Coverage Δ
unittests	76.73% <ø> (ø)

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

Impacted Files	Coverage Δ
pydra/engine/task.py	86.76% <ø> (ø)

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