Ospray: Support vtkPartitionedDataSetCollections from vtkGeometryRepresention
OSpray now propely supports vtkPartitionedDataSetCollections genereated by vtkGeometryRepresention. 2. Also it fixes some deprecations that needed to happen, and makes sure that the instance of multiblock is appropriately created.
This MR depends on vtk/vtk!10930 (merged).
This MR resolves #22505 (closed).
cc: @mwestphal @nicolas.vuaille @ben.boeckel @cory.quammen @demarle