Only run lightweight sync between replicas during restore [DDB-1415]

Lightweight replica sync skips parts merges, part mutations, metadata alter,
part cloning from other shards, and pinned part UUID sync. This should be good
enough for the cluster to be in a working state, leaving the remaining work to
be done asynchronously.

astacus/coordinator/plugins/clickhouse/steps.py

@@ -1021,7 +1021,7 @@ async def run_step(self, cluster: Cluster, context: StepsContext) -> None:
         def _sync_replicas(client: ClickHouseClient) -> Iterator[Awaitable[None]]:
             yield from (
                 execute_with_timeout(
-                    client, self.sync_timeout, f"SYSTEM SYNC REPLICA {table.escaped_sql_identifier}".encode()
+                    client, self.sync_timeout, f"SYSTEM SYNC REPLICA {table.escaped_sql_identifier} LIGHTWEIGHT".encode()
                 )
                 for table in manifest.tables
                 if table.is_replicated