Tweak complex test

This test is problematic on GitHub Actions because the build agents are
SO SLOW.

Author: DavidZidar

src/TinyIpc/Messaging/TinyMessageBus.Tests.cs

@@ -90,6 +90,10 @@ public async Task All_messages_should_be_processed_even_with_multiple_buses_in_a
 			await buses[rnd.Next() % buses.Length].PublishAsync(messages, cancellationToken);
 		}
 
+		// Force a read of all messages to work around timing issues
+		await messagebus1.ReadAsync();
+		await messagebus2.ReadAsync();
+
 		// Add a new bus to the mix
 		using var messagebus3 = new TinyMessageBus(name);
 
@@ -101,7 +105,7 @@ public async Task All_messages_should_be_processed_even_with_multiple_buses_in_a
 			await buses[rnd.Next() % buses.Length].PublishAsync(messages, cancellationToken);
 		}
 
-		// Force a final read of all messages to work around timing issuees
+		// Force a final read of all messages to work around timing issues
 		await messagebus1.ReadAsync();
 		await messagebus2.ReadAsync();
 		await messagebus3.ReadAsync();