Port Akka.Tests.Actor tests to async/await - BugFix4823Spec (#5769

)

* Port `Akka.Tests.Actor` tests to `async/await` - `BugFix4823Spec`

* Removed ask-timeout code to make CI/CD work faster, will add this later

Co-authored-by: Gregorius Soedharmo <arkatufus@yahoo.com>

src/core/Akka.Tests/Actor/BugFix4823Spec.cs

@@ -22,12 +22,12 @@ public BugFix4823Spec(ITestOutputHelper outputHelper) : base(outputHelper)
         }
 
         [Fact]
-        public void Actor_should_not_loose_self_context_after_async_call()
+        public async Task Actor_should_not_loose_self_context_after_async_call()
         {
             var identity = ActorOfAsTestActorRef<MyActor>(Props.Create(() => new MyActor(TestActor)), TestActor);
             identity.Tell(NotUsed.Instance);
-            var selfBefore = ExpectMsg<IActorRef>();
-            var selfAfter = ExpectMsg<IActorRef>();
+            var selfBefore = await ExpectMsgAsync<IActorRef>();
+            var selfAfter = await ExpectMsgAsync<IActorRef>();
             selfAfter.Should().Be(selfBefore);
         }