TF-1842: Create deleteSendingEmail in domain layer

(cherry picked from commit b66931aa1b6cabb7ac32d9457d6d4ed69d3ea42d)

lib/features/email/domain/state/delete_sending_email_state.dart

@@ -0,0 +1,17 @@
+import 'package:core/presentation/state/failure.dart';
+import 'package:core/presentation/state/success.dart';
+
+class DeleteSendingEmailLoading extends UIState {}
+
+class DeleteSendingEmailSuccess extends UIState {
+
+  @override
+  List<Object?> get props => [];
+}
+
+class DeleteSendingEmailFailure extends FeatureFailure {
+  DeleteSendingEmailFailure(dynamic exception) : super(exception: exception);
+
+  @override
+  List<Object?> get props => [exception];
+}