[Epoch Sync] Blocks received during state sync marked as invalid

[robin-near]

After epoch sync and the header sync that follows, we do state sync. During the state sync, recent blocks that are received from other peers are marked invalid by the node. I suspect this is because our HEAD is still at genesis and there's some heuristic that rejects blocks whose heights are too far from the genesis. We should fix that; otherwise after state sync is done we will not be able to block sync all the way - as we would be stuck on some block marked as invalid earlier.