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Fix tunneling of CF decisions to inactive graph regions in multi-parent configurations

Illya Shapoval requested to merge ishapova/Gaudi:fix-CF-tunneling-to-inactive-subgraphs into master

This is a scalable bottom-up alternative to !857 (closed).

  • added a scout visitor to walk through a graph lineage of a node to deduce if the node is considered active through that lineage (the scout is used for multi-parent nodes before the main - promoting - traversal is triggered);
  • added test with an algorithm shared by two CF branches one of which early terminates;
  • added view-awareness to subgraph scouts and removed CFplusViewBug test (provided by @bwynne).

This MR is based on !861 (merged) (one commit on top), please jump to that one first.

@bwynne, FYC.

Edited by Illya Shapoval

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