chore: improve sync-gossip transition

[mfrankovi]

When node restarts and finishes syncing, transition to synced state and gossiping is often accompanied with large number of error logs. These logs are related to node getting synced or almost synced and receiving cert votes for a block but missing the actual pbft block and reward votes or dag blocks. In this PR some improvements are made to address this:

1. In tryPushCertVotesBlock if we have 2t+1 cert votes but missing a pbft block and/or reward votes, there is a great chance that other nodes have advanced so try to resync
2. Do not try to push cert voted block while syncing since this is very likely to fail. Only push cert voted blocks ones syncing is complete
3. When sending final pbft sync block, mark peer as synced so that the gossiping is started at the same time node gets synced without the delay
4. Update peer->pbft_chain_size_ earlier in propose vote processing to have more accurate peer pbft_chain_size in case restarting pbft syncing is needed

[taraxadeploy]

prnet cleaned-up successfully