Format test Javadoc and reorder imports

Normalize Javadoc formatting and reorder static JUnit imports for consistency in messaging tests. Converted multi-line test Javadocs to single-line comments and adjusted import ordering in the following files:

- microservices-messaging/src/test/java/com/iluwatar/messaging/KafkaMessageConsumerTest.java
- microservices-messaging/src/test/java/com/iluwatar/messaging/KafkaMessageProducerTest.java
- microservices-messaging/src/test/java/com/iluwatar/messaging/OrderServiceTest.java

No functional changes.

Author: Mukul-Howale

microservices-messaging/src/test/java/com/iluwatar/messaging/KafkaMessageConsumerTest.java

@@ -40,9 +40,7 @@
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 
-/**
- * Unit tests for {@link KafkaMessageConsumer}.
- */
+/** Unit tests for {@link KafkaMessageConsumer}. */
 class KafkaMessageConsumerTest {
 
   private MockConsumer<String, String> mockConsumer;

microservices-messaging/src/test/java/com/iluwatar/messaging/KafkaMessageProducerTest.java

@@ -24,8 +24,8 @@
  */
 package com.iluwatar.messaging;
 
-import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
+import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertNotNull;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
@@ -34,9 +34,7 @@
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 
-/**
- * Unit tests for {@link KafkaMessageProducer}.
- */
+/** Unit tests for {@link KafkaMessageProducer}. */
 class KafkaMessageProducerTest {
 
   private MockProducer<String, String> mockProducer;

microservices-messaging/src/test/java/com/iluwatar/messaging/OrderServiceTest.java

@@ -24,8 +24,8 @@
  */
 package com.iluwatar.messaging;
 
-import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
+import static org.junit.jupiter.api.Assertions.assertEquals;
 
 import org.apache.kafka.clients.producer.MockProducer;
 import org.apache.kafka.common.serialization.StringSerializer;