[State Sync] Reduce polling frequency to 200ms.
[State Sync] Reduce polling frequency to 200ms.

Closes: #1046

aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core