incentives: handle round 0 "top voters" lookups for easier testing #6159
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Summary
Addresses feedback for PR #6085 to make E2E and unit tests easier to use when testing incentives & heartbeats — don't wait until the first time the state proof voters tracker starts calculating & caching the "Top N voters" information (at 256-16=240 rounds). This adds special case handling for round 0 when calling GetKnockOfflineCandidates to fetch that data from the genesis accounts.
Test Plan
Will untangle a couple of tests for this change from other, bigger WIP test changes I described in #6085 (comment)