hinTS handoff should externalize purges in `HistoryProofVote` state changes

[tinker-michaelj]

When both hinTS and history are enabled, the last domino that tips us to handoff from the active ith (hinTS, chain-of-trust proof)construction to the next is aHistoryProofVotethat finalizes the chain-of-trust proof fori+1`.

Each handoff has the side-effect of purging from state the artifacts used in the ith construction:

1. Votes on the hinTS preprocessing stage output
2. WRAPS protocol MPC messages for the aggregate Schnorr signature
3. Votes on the final chain-of-trust proof

⚠️ However, the callback that orchestrates this here is not using the "triggering" HistoryProofVote's state stack to purge hinTS preprocessing votes. It follows these purges are not externalized in the block stream until the next HintsPartialSignature tx commits HintsService states.