TF-3517 Add integration test for case Save draft without Reply-To & reopen it

Signed-off-by: dab246 <tdvu@linagora.com>

integration_test/robots/mailbox_menu_robot.dart

@@ -1,4 +1,8 @@
 
+import 'package:flutter_test/flutter_test.dart';
+import 'package:tmail_ui_user/features/mailbox/presentation/widgets/label_mailbox_item_widget.dart';
+import 'package:tmail_ui_user/features/mailbox/presentation/widgets/mailbox_item_widget.dart';
+
 import '../base/core_robot.dart';
 
 class MailboxMenuRobot extends CoreRobot {
@@ -7,4 +11,11 @@ class MailboxMenuRobot extends CoreRobot {
   Future<void> openAppGrid() async {
     await $(#toggle_app_grid_button).tap();
   }
+
+  Future<void> openFolderByName(String name) async {
+    await $(MailboxItemWidget)
+      .$(LabelMailboxItemWidget)
+      .$(find.text(name))
+      .tap();
+  }
 }