fix: add key to mock execution step

Author: kevinkim-ogp

packages/backend/src/apps/toolbox/__tests__/actions/for-each/get-data-out-metadata.test.ts

@@ -14,6 +14,7 @@ describe('getDataOutMetadata', () => {
     errorDetails: {},
     status: 'success' as const,
     appKey: 'toolbox',
+    key: 'forEach',
     createdAt: '2023-01-01T00:00:00Z',
     updatedAt: '2023-01-01T00:00:00Z',
     metadata: {},