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Fix crash in `vtkPolyhedron::IsInside` when multithread execution

Francois Mazen requested to merge francois.mazen/vtk:test_threadsafe_random into master

Relates #19182

Fix random crashes in ParaView, especially using the "Resample to Image" filter. This filter calls vtkMath::Random through the vtkPolyhedron::isInside method which is not thread safe.

This is a multi-threading concurrency issue, so hard to test in a reliable way unless you run a code X times hoping to crash. So I haven't written any test, but I can do so if required.

Edited by Francois Mazen

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