Polish "Fix JMS integration tests"

The configuration had moved to Java config and the XML file wasn't
remove. This is done as part of this commit.

See gh-1549

Author: snicoll

spring-ws-support/src/test/java/org/springframework/ws/transport/jms/JmsMessageSenderIntegrationTests.java

@@ -43,6 +43,7 @@
 import org.springframework.jms.annotation.EnableJms;
 import org.springframework.jms.annotation.JmsListener;
 import org.springframework.jms.config.DefaultJmsListenerContainerFactory;
+import org.springframework.jms.connection.SingleConnectionFactory;
 import org.springframework.jms.core.BrowserCallback;
 import org.springframework.jms.core.JmsTemplate;
 import org.springframework.jms.core.MessagePostProcessor;
@@ -246,8 +247,8 @@ Object handleRequest(jakarta.jms.Message message) {
 	static class JmsBrokerConfig {
 
 		@Bean
-		ActiveMQConnectionFactory connectionFactory() {
-			return new ActiveMQConnectionFactory("vm://localhost?broker.persistent=false");
+		SingleConnectionFactory connectionFactory() {
+			return new SingleConnectionFactory(new ActiveMQConnectionFactory("vm://localhost?broker.persistent=false"));
 		}
 
 		@Bean