Exit topological sort earlier #2965
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Why this should be merged
Previously the consensus logic may have marked a node as having more inbound edges than it actually had because the traversal would not exit after hitting a node that was already seen.
This could cause some votes to be dropped which could increase time-to-finality.
How this works
Exits the topological sort as soon as a node that has been previously touched is seen (rather than waiting for a node that previously had inbound edges).
How this was tested