update to use deconstructed

EnvelopeGenerator.Tests.Application/HistoryTests.cs

@@ -64,8 +64,8 @@ public class HistoryTests
             .Select(async email =>
             {
                 var cmd = new CreateReceiverCommand { EmailAddress = email };
-                var res = await Mediator.Send(cmd);
+                var (Id, AlreadyExists) = await Mediator.Send(cmd);
-                return (res.Id, email);
+                return (Id, email);
             })
         );
         _receivers.AddRange(receivers);