feat: allow filtering returns by order_id (#8225)

packages/medusa/src/api/admin/returns/validators.ts

@@ -29,6 +29,7 @@ export const AdminGetOrdersParams = createFindParams({
 }).merge(
   z.object({
     id: z.union([z.string(), z.array(z.string())]).optional(),
+    order_id: z.union([z.string(), z.array(z.string())]).optional(),
     status: z.union([z.string(), z.array(z.string())]).optional(),
     created_at: createOperatorMap().optional(),
     updated_at: createOperatorMap().optional(),