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TemporalParticlesToPathlines Filter Should Support Composite Datasets

In #21162 (comment 1109104), we realized that the implementation of the TemporalParticlesToPathlines filter, which uses vtkTemporalPathLineFilter, does not yet support composite datasets (vtkMultiBlockDataSets).

As a work-around, we need to apply the MergeBlocks filter first.

This affects the openPMD reader and the AMReX plotfile reader.

cc @berkgeveci

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