TF-3585 Add unit test & integration test for read receipt dialog

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

integration_test/tests/compose/send_email_with_read_receipt_enabled_test.dart

@@ -0,0 +1,9 @@
+import '../../base/test_base.dart';
+import '../../scenarios/send_email_with_read_receipt_enabled_scenario.dart';
+
+void main() {
+  TestBase().runPatrolTest(
+    description: 'Should see read receipt dialog when user toggle read receipt and open read receipt email',
+    scenarioBuilder: ($) => SendEmailWithReadReceiptEnabledScenario($),
+  );
+}