Remove signers older than the current reward cycle if they have no more blocks to process #5562
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We used to keep reward cycle signers for an extra reward cycle in prep for potentially the fallback scenario where signers would continue signing blocks/sbtc transactions if the incoming signers failed to initialize. However, this is really confusing our partners who don't understand why their logs report stale signers as operating. Also this old logic was flawed anyway as we only ever kept 2 signers around anyway (the hashmap of signers is keyed by the reward_cycle % 2). The cleanup function as it was essentially was a no-op.
This code change makes the function delete anything that has no unprocessed blocks in its database and that is for a reward cycle older than the current reward cycle. We can always revert or add additional logic about when to delete them when we start giving potential responsibilities to "stale" signers.
Closes #5507