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vtkUnstructuredGrid::ShallowCopy allocates connectivity if necessary

Bengt Rosenberger requested to merge Bengt/vtk:fix-unstructuredbase-to-unstructured-shallowcopy into master

Fix for #18722 (closed).

Made vtkUnstructuredGrid::ShallowCopy check and allocate internal arrays as necessary when input is a vtkUnstructuredGridBase. This prevents an access violation if vtkUnstructuredGrid::Initialize was called before.

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