Feat: Display error messages from intermediate nodes of the webhook. #10427 (#11954)

### What problem does this PR solve?

Feat: Remove HMAC from the webhook #10427

### Type of change


- [x] New Feature (non-breaking change which adds functionality)

web/src/pages/agent/form/begin-form/index.tsx

@@ -43,6 +43,7 @@ function BeginForm({ node }: INextOperatorForm) {
   const form = useForm({
     defaultValues: values,
     resolver: zodResolver(BeginFormSchema),
+    mode: 'onChange',
   });
 
   useWatchFormChange(node?.id, form);