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Add support for composite datasets to vtkExtractTemporalFieldData.

vtkExtractTemporalFieldData poorly handled composite datasets, esp. those generated by readers like vtkExodusIIReader. Added ability to the filter to use only the 1st non-empty leaf node's field-data to produce the output -- a more suitable solution for vtkExodusIIReader's output, since vtkExodusIIReader duplicates global data on all leaf nodes.

Added a test, extractTemporalFieldData, that tests this filter along with the new functionality.

Needed to address paraview/paraview#16100 (closed).

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