Heartbeat Functionality (& checksums) Not fired in Edge Case

[bugbytesinc]

An edge case exists that causes the checksums of some ballots to not be calculated in the webapp server back-end. What happens is that the "latest update time" is stale for a longer-than-desired period of time, preventing the server from seeing that the checksum for some ballots can be processed because this stale time is behind the "end voting time" of the ballot.

Need to add code to recognizes that a replay of the HCS message stream is complete and that we should (at this point) grab the latest transaction date from the ledger (proper) and run a checksum/heartbeat loop to bring all data/state into sync.