Use cucumber for integration tests

integration-tests/tests/common/balances.rs

@@ -30,8 +30,7 @@ pub async fn transfer(
 
     let _events = create_block_with_extrinsic(
         &client,
-        api
-            .tx()
+        api.tx()
             .balances()
             .transfer(to.clone().into(), amount)
             .create_signed(&from, ())