ci: skip pyvista notebooks on mac/windows

[wpbonelli]

#2574 was evidently not sufficient to fix all pyvista notebook issues in CI. for some reason pyvista now can't be found on mac and windows. problem does not occur on linux. just skip the pyvista notebook on mac and windows

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.5%. Comparing base (556c088) to head (532dfd6).
⚠️ Report is 46 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2602      +/-   ##
===========================================
+ Coverage     55.5%    72.5%   +16.9%     
===========================================
  Files          644      667      +23     
  Lines       124135   128642    +4507     
===========================================
+ Hits         68947    93315   +24368     
+ Misses       55188    35327   -19861     

see 554 files with indirect coverage changes

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