HPS not correct post warmup when shut down mid-snapshot (replica)

If we shutdown then warmup mid-snapshot (that contains a prepare) then post warmup we will expose a HPS value that is invalid as the replica has not received a full snapshot. We should only move the HPS value on complete snapshots.

Say we receive a memory snapshot marker with snap start of 1 and snap end of 2. We receive a prepare at seqno 1. If we crash and warmup after persisting seqno 1 but not 2 then we will set the HPS value to 1 which is incorrect and breaks durability constraints. Before crashing our in-memory HPS would remain at 0 as we need an entire sanpshot to move the HPS.