fix(nns): Fix benchmark by simulating proper behavior in canbench-rs build #3160
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In order to get approximately the same number of read/writes in stable for the VotingStateMachine, it is required to count accurately. Canbench doesn't allow queries, which means the instruction_counter never gives a different result, which means the benchmark thinks it runs out of cycles on every iteration, and thus saves and restores the ProposalVotingStateMachine over and over, leading to an inaccurate benchmark compared to production.
This adds code to approximately simulate behavior in canbench-rs build.