GH-1376: Fix ContainerCustomizer

Resolves #1376

The customizer was not called for containers created for `@KafkaListener`,
only for containers created manually via the factory.

**cherry-pick to 2.3.x**

(cherry picked from commit ba78721)

Author: garyrussell

spring-kafka/src/main/java/org/springframework/kafka/config/AbstractKafkaListenerContainerFactory.java

@@ -343,7 +343,7 @@ public C createListenerContainer(KafkaListenerEndpoint endpoint) {
 
 		endpoint.setupListenerContainer(instance, this.messageConverter);
 		initializeContainer(instance, endpoint);
-
+		customizeContainer(instance);
 		return instance;
 	}
 

spring-kafka/src/test/java/org/springframework/kafka/listener/ContainerStoppingBatchErrorHandlerTests.java

@@ -107,6 +107,7 @@ public void stopContainerAfterException() throws Exception {
 		assertThat(two).isSameAs(this.config.springManagedContainer());
 		assertThat(one.getListenerId()).isEqualTo(CONTAINER_ID);
 		assertThat(two.getListenerId()).isEqualTo("springManagedContainer");
+		assertThat(this.config.customized).isEqualTo(2);
 	}
 
 	@Configuration
@@ -123,6 +124,8 @@ public static class Config {
 
 		private final CountDownLatch commitLatch = new CountDownLatch(3);
 
+		private volatile int customized;
+
 		@KafkaListener(id = CONTAINER_ID, topics = "foo")
 		public void foo(List<String> in) {
 			this.deliveryLatch.countDown();
@@ -212,6 +215,7 @@ public void handle(Exception thrownException, ConsumerRecords<?, ?> records,
 
 			});
 			factory.setBatchListener(true);
+			factory.setContainerCustomizer(container -> this.customized++);
 			return factory;
 		}