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WIP: Fix for vtkConnectivityFilter: MultiBlock data set handling

This PR fixes: #17329

The connectivity, when executed on a multi-block data sets processed each block independently. As a result, the RegionId was reset to 0 for each component. This PR improves the Connectivity Filter by allowing it to handle Composite data sets, so the RegionId is now dealt with correctly. There is still a limitation though: each node in the composite data set needs to be a point set, otherwise it is ignored (with a warning).

Edited by Cory Quammen

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