Fix: add codeexec attachments output (#14787)

### What problem does this PR solve?

add codeexec attachments output

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

web/src/utils/canvas-util.tsx

@@ -73,6 +73,10 @@ function getNodeOutputs(x: BaseNode) {
       type: JsonSchemaDataType.String,
       value: '',
     },
+    attachments: outputs.attachments ?? {
+      type: 'Array<String>',
+      value: [],
+    },
   };
 }