Ignore stream connections in unexpected states

A connection which terminated before it was fully established
would lead to a function_clause, since metadata is not available
to really call notify_connection_closed. We can just ignore such
connections and not notify about them.

Resolves #13670

Author: mkuratczyk

deps/rabbitmq_stream/src/rabbit_stream_reader.erl

@@ -3221,7 +3221,9 @@ notify_connection_closed(#statem_data{
          {client_properties, ClientProperties}],
     rabbit_event:notify(connection_closed,
                         augment_infos_with_user_provided_connection_name(EventProperties,
-                                                                         Connection)).
+                                                                         Connection));
+notify_connection_closed(#statem_data{}) ->
+    ok.
 
 handle_frame_post_close(_Transport,
                         Connection,