fix: use dart test and revert comment change in generated-ish file

Author: sigurdm

.ci/scripts/plugin_tools_tests.sh

@@ -5,4 +5,4 @@
 set -e
 
 cd script/tool
-dart run test
+dart test

packages/in_app_purchase/in_app_purchase_storekit/lib/src/store_kit_wrappers/sk_product_wrapper.dart

@@ -10,7 +10,7 @@ import '../messages.g.dart';
 import 'enum_converters.dart';
 
 // WARNING: Changes to `@JsonSerializable` classes need to be reflected in the
-// below generated file. Run `dart run build_runner watch` to
+// below generated file. Run `flutter packages pub run build_runner watch` to
 // rebuild and watch for further changes.
 part 'sk_product_wrapper.g.dart';