Unified API response json schema (#3170)

### What problem does this PR solve?

Unified API response json schema

### Type of change

- [x] Refactoring

web/src/pages/flow/utils.ts

@@ -144,7 +144,7 @@ export const buildDslComponentsByGraph = (
 };
 
 export const receiveMessageError = (res: any) =>
-  res && (res?.response.status !== 200 || res?.data?.retcode !== 0);
+  res && (res?.response.status !== 200 || res?.data?.code !== 0);
 
 // Replace the id in the object with text
 export const replaceIdWithText = (