support test mock chaining

Author: tkotthakota-adobe

packages/spacecat-shared-data-access/src/models/site/config.js

@@ -866,6 +866,6 @@ Config.toDynamoItem = (config) => ({
   llmo: config.getLlmoConfig(),
   tokowakaConfig: config.getTokowakaConfig(),
   edgeOptimizeConfig: config.getEdgeOptimizeConfig(),
-  onboardConfig: config.getOnboardConfig(),
+  onboardConfig: config.getOnboardConfig?.(),
   commerceLlmoConfig: config.getCommerceLlmoConfig?.(),
 });