TF-3570 Add integration test for case mark as unread in EmailView

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

integration_test/tests/email_detailed/mark_as_unread_email_when_open_detailed_email_test.dart

@@ -0,0 +1,9 @@
+import '../../base/test_base.dart';
+import '../../scenarios/email_detailed/mark_as_unread_email_scenario.dart';
+
+void main() {
+  TestBase().runPatrolTest(
+    description: 'Should see email item has unread icon when open detailed email and select mark as unread email successfully',
+    scenarioBuilder: ($) => MarkAsUnreadEmailScenario($),
+  );
+}