update export Controller to return posted job

backend/src/controllers/exportController.ts

@@ -57,7 +57,7 @@ class ExportController {
                 this.exportJobs[jobIndex].state = "finished";
                 this.exportJobs[jobIndex].updated_at = new Date();
             }, timeout, jobIndexToUpdate);
-            response.send();
+            response.send(fullExportJob);
         }
     }
 }