Revert "spawn statement executor"

This reverts commit 65f2b8d.

node/service/src/lib.rs

@@ -605,26 +605,6 @@ where
  );
  }
 
- // Spawn statement protocol worker
- let statement_protocol_executor = {
- let spawn_handle = task_manager.spawn_handle();
- Box::new(move |fut| {
- spawn_handle.spawn("network-statement-validator", Some("networking"), fut);
- })
- };
- let statement_handler = statement_handler_proto.build(
- network.clone(),
- sync_service.clone(),
- statement_store.clone(),
- prometheus_registry.as_ref(),
- statement_protocol_executor,
- )?;
- task_manager.spawn_handle().spawn(
- "network-statement-handler",
- Some("networking"),
- statement_handler.run(),
- );
-
  if enable_offchain_worker {
  task_manager.spawn_handle().spawn(
  "offchain-workers-runner",