Fix open blocks not getting activated through dependencies #2800
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This was a regression introduced by #2778
Adds two tests to ensure proper behavior:
election.dependencies_open_link
which covers the fix by itselfnode.dependency_graph_frontier
, a more complex test ensuring we can walk down a more complex graph before confirming it from the bottom up. This test is a bit long at 8 to 10 seconds (same with sanitizers though), but seems like a strong addition.