Remove unused ProcessCellField and ProcessPointField

Li-Ta Lorequested to merge
ollielo/vtk-m:process_cell_field_cleanup into master

Many of the mapping of cell and point fields for filters are just some form of permutation. This has been abstracted as vtkm::filter::MapFieldPermutation which replaces the original worklet.Process[Cell|Point]Field. Remove those unused methods from worklets.

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