Enhance invoice and self-serve logic with subuser support

- Add subuser ID management to `selfserve_lane_command_arguments`.
- Update `invoice` function to include optional command arguments.
- Attach metadata to orders with self-serve and subuser details.
- Introduce `OTHER_TYPE_SELF_SERVE_WASH` in `attachment_content`.

services/nginx/app/tests/Api/OrderItemsApiTest.php

@@ -100,7 +100,7 @@ it('returns the extraordinary chemistry product with requires_note enabled', fun
         'price' => 299,
         'requires_note' => 0,
     ]);
-    $session = api_fixtures()->createUserSession(['list_products']);
+    $session = api_fixtures()->createUserSession([], ['group_id' => 1]);
 
     $response = api_client()->get('/products?id=' . $product['id'], $session['headers']);