Refactor code structure for improved readability and maintainability

apps/edr-freight-web/backoffice/src/services/trainScheduling.service.ts

@@ -756,6 +756,15 @@ export const trainSchedulingService = {
     return response.data;
   },
 
+  /** The schedule detail page's wagon-list Excel export. */
+  downloadScheduleWagonsWorkbook: async (scheduleId: string): Promise<Blob> => {
+    const response = await client.get(
+      URL_CONSTANTS.TRAIN_SCHEDULING.SCHEDULE_WAGONS_EXPORT(scheduleId),
+      { responseType: "blob" },
+    );
+    return response.data as Blob;
+  },
+
   downloadIntercityMarshallingDocument: async (
     scheduleId: string,
   ): Promise<Blob> => {