fix(deltaSync): Make sure query manager is initialized

Related to this issue https://forums.aws.amazon.com/thread.jspa?messageID=893237&#893237

Author: elorzafe

packages/aws-appsync/src/deltaSync.ts

@@ -417,6 +417,7 @@ const effect = async <TCache extends NormalizedCacheObject>(
 
         boundSaveSnapshot(store, client.cache);
 
+        client.initQueryManager();
         const dataStore = client.queryManager.dataStore;
         const enqueuedActionsFilter = [mutationsConfig.enqueueAction];
         enquededMutations