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