ENH: improve clarity of error messages for OffAxisSlicePlot with curvilinear geometries #4038
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PR Summary
Closes #2619
Note to reviewers: I have no idea if OffAxisSlicePlot and OffAxisProjectionPlot actually work with spectral cubes, I'm not even sure it would make sense, though I don't know of a sample dataset with this geometry or how to create a fake one