chore(sequencing): remove ConsensusMessage from simulation network

[guy-starkware]

I've had to simplify the test in this file (simulation_network_receiver_test.rs) so it now only works with Vote type messages.

I'm not sure what would be a good way to also check the proposal channel, or if it is even necessary to add that check.

[reviewable-StarkWare]

This change is 

[guy-starkware]

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• chore(consensus): remove irrelevant TODO items #2671
• chore(sequencing): remove ConsensusMessage and Proposal from proto #2559
• chore(sequencing): remove ConsensusMessage from context #2533
• fix(sequencing): make repropose use the proper channel #2532
• chore(sequencing): remove ConsensusMessage from simulation network #2528 👈 (View in Graphite)
• chore(sequencing): remove ConsensusMessage from stream_handler_test #2526
• chore(sequencing): remove ConsensusMessage from converter test #2525
• chore(sequencing): remove mock context from manager_test.rs #2524
• chore(sequencing): add specific print message for wrong tx type #2518
• chore(sequencing): replace BTreeMap with HashMap in StreamHandler #2517
• chore(sequencing): remove ProposalChunk #2512
• chore(sequencing): remove ProposalWrapper #2510
• main

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##             guyn/streams/remove_consensus_message2   #2528   +/-   ##
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