[enhance] close_sinks rule false positive

[huang12zheng]

class PassportBloc extends FormBloc<String,String> with PasswordFormMixin{
  /// injectong to close <----
  PassportBloc(){
    addFieldBlocs(
      fieldBlocs: [password, confirmPassword]
    );
  }
  @override
  void onSubmitting() {
  }

}

mixin PasswordFormMixin on FormBloc<String,String>{

  final userName = TextFieldBloc(
    validators: [FieldBlocValidators.required]
  );
  /// would close in [PassportBloc].close by construction's injection <----
  //ignore: close_sinks
  final password = TextFieldBloc(
    validators: [FieldBlocValidators.required]
  );
  /// [PassportBloc]
  //ignore: close_sinks
  final confirmPassword = TextFieldBloc(
    validators: [FieldBlocValidators.required]
  );

It mightn‘t have something to do with #57882