Fix test flake

Sometimes in CI under Khepri, the test case errored with:
```
receiver_attached flushed: {amqp10_event,
                            {session,<0.396.0>,
                             {ended,
                              {'v1_0.error',
                               {symbol,<<"amqp:internal-error">>},
                               {utf8,
                                <<"stream queue 'leader_transfer_stream_credit_single' in vhost '/' does not have a running replica on the local node">>},
                               undefined}}}}
```

(cherry picked from commit d7f2942)

Author: ansd

deps/rabbit/test/amqp_client_SUITE.erl

@@ -3108,6 +3108,10 @@ leader_transfer(QName, QType, Credit, Config) ->
     ok = wait_for_accepts(NumMsgs),
     ok = detach_link_sync(Sender),
 
+    %% Wait a bit to avoid the following error when attaching:
+    %% "stream queue <name> does not have a running replica on the local node"
+    timer:sleep(50),
+
     Filter = consume_from_first(QType),
     {ok, Receiver} = amqp10_client:attach_receiver_link(
                        Session0, <<"receiver">>, Address,