NO-JIRA fix flaky test QueueControlTest#testListMessagesWithEmptyFilter

The below error is prevented by using Wait.assertEquals
where Assert.assertEquals was used previously.

    java.lang.AssertionError:
    Expected :2
    Actual   :1
        [...]
        at org.apache.activemq.artemis.tests.integration.management.QueueControlTest.testListMessagesWithEmptyFilter(QueueControlTest.java:827)

(cherry picked from commit 5c2f79e)

tests/integration-tests/src/test/java/org/apache/activemq/artemis/tests/integration/management/QueueControlTest.java

@@ -823,13 +823,11 @@ public void testListMessagesWithEmptyFilter() throws Exception {
       producer.send(session.createMessage(durable));
       producer.send(session.createMessage(durable));
 
-      Map<String, Object>[] messages = queueControl.listMessages("");
-      Assert.assertEquals(2, messages.length);
+      Wait.assertEquals(2, () -> queueControl.listMessages("").length);
 
       consumeMessages(2, session, queue);
 
-      messages = queueControl.listMessages("");
-      Assert.assertEquals(0, messages.length);
+      Wait.assertEquals(0, () -> queueControl.listMessages("").length);
 
       session.deleteQueue(queue);
    }