fix(Pulsar): Wait until the consumer becomes connected (#1467)

Author: HofmeisterAn

tests/Testcontainers.Pulsar.Tests/PulsarContainerTest.cs

@@ -63,6 +63,9 @@ public async Task ConsumerReceivesSendMessage()
         _ = await consumer.OnStateChangeTo(ConsumerState.Active, TimeSpan.FromSeconds(10), TestContext.Current.CancellationToken)
             .ConfigureAwait(true);
 
+        _ = await producer.OnStateChangeTo(ProducerState.Connected, TimeSpan.FromSeconds(10), TestContext.Current.CancellationToken)
+            .ConfigureAwait(true);
+
         _ = await producer.Send(helloPulsar, cancellationToken: TestContext.Current.CancellationToken)
             .ConfigureAwait(true);