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Fix #17879: improve logic that determine when to deliver data

Utkarsh Ayachit requested to merge utkarsh.ayachit/paraview:fix_17879 into master

The logic in vtkPVDataDeliveryManager that would result in deciding which representation delivered data that the potential to miss representation that produced empty data under special cases. This was because vtkPVDataDeliveryManager was depending on data's MTime which doesn't always change when vtkPVDataRepresentation::RequestData is executed. Fixed that using a more robust vtkDemandDrivenPipeline::DataTime instead.

Also added a test for the same.

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