CI: Disable nipy tests generally, re-add with max numpy

[effigies]

Summary

CI is broken because nipy is not being updated to deal with numpy deprecations. This removes nipy tests generally. I'm seeing if I can add a requirement config that will cap numpy for now so we don't skip these tests entirely.

[codecov]

Codecov Report

Base: 47.56% // Head: 63.63% // Increases project coverage by +16.07% 🎉

Coverage data is based on head (e4c0fe6) compared to base (f98ce46).
Patch has no changes to coverable lines.

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #3532       +/-   ##
===========================================
+ Coverage   47.56%   63.63%   +16.07%     
===========================================
  Files         309      309               
  Lines       40844    40873       +29     
  Branches     5381     5381               
===========================================
+ Hits        19427    26011     +6584     
+ Misses      21299    13838     -7461     
- Partials      118     1024      +906     

Impacted Files	Coverage Δ
nipype/pipeline/plugins/pbs.py	16.90% <0.00%> (-0.25%)	⬇️
nipype/pipeline/plugins/condor.py	15.94% <0.00%> (-0.24%)	⬇️
nipype/pipeline/plugins/lsf.py	16.21% <0.00%> (-0.23%)	⬇️
nipype/pipeline/plugins/oar.py	18.60% <0.00%> (-0.22%)	⬇️
nipype/pipeline/plugins/slurm.py	13.25% <0.00%> (-0.17%)	⬇️
nipype/pipeline/plugins/sgegraph.py	11.36% <0.00%> (-0.14%)	⬇️
nipype/pipeline/plugins/slurmgraph.py	10.98% <0.00%> (-0.13%)	⬇️
nipype/interfaces/mrtrix/convert.py	15.73% <0.00%> (-0.09%)	⬇️
nipype/interfaces/minc/minc.py	85.20% <0.00%> (+0.01%)	⬆️
nipype/algorithms/mesh.py	29.70% <0.00%> (+0.49%)	⬆️
... and 118 more

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