[release] vtkUnstructuredGrid: remove deprecation of GetCellTypes
This API is also present in vtkDataSet. It was not deprecated there,
and it is a core API. It is just better to rewind this deprecation.
Backport: paraview/release
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This API is also present in vtkDataSet. It was not deprecated there,
and it is a core API. It is just better to rewind this deprecation.
Backport: paraview/release