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/pages/agent/form-sheet/single-debug-sheet/utils.ts

@@ -4,6 +4,7 @@ import { CodeOutputContract } from '../../form/code-form/utils';
 const SYSTEM_OUTPUT_NAMES = new Set([
   '_ERROR',
   '_ARTIFACTS',
+  'attachments',
   '_ATTACHMENT_CONTENT',
 ]);
 

web/src/pages/agent/form/code-form/utils.ts

@@ -14,6 +14,7 @@ const CodeExecReservedOutputKeys = [
   'content',
   'actual_type',
   'raw_result',
+  'attachments',
   '_ERROR',
   '_ARTIFACTS',
   '_ATTACHMENT_CONTENT',
@@ -30,6 +31,10 @@ export const CodeExecPanelSystemOutputs: ICodeForm['outputs'] = {
     type: 'String',
     value: '',
   },
+  attachments: {
+    type: 'Array<String>',
+    value: [],
+  },
 };
 
 const CodeExecReservedOutputKeySet = new Set<string>(

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: [],
+    },
   };
 }