wip: fixing checkstyle violations in testing folder files.

Author: vasantteja

instrumentation/kafka/kafka-connect-2.6/testing/src/test/java/io/opentelemetry/instrumentation/kafkaconnect/v2_6/MongoKafkaConnectSinkTaskTest.java

@@ -489,7 +489,7 @@ private static int getRandomFreePort() {
     try (ServerSocket serverSocket = new ServerSocket(0)) {
       return serverSocket.getLocalPort();
     } catch (IOException e) {
-      e.printStackTrace();
+      logger.error("Failed to get random free port", e);
       return 0;
     }
   }

instrumentation/kafka/kafka-connect-2.6/testing/src/test/java/io/opentelemetry/instrumentation/kafkaconnect/v2_6/PostgresKafkaConnectSinkTaskTest.java

@@ -417,7 +417,7 @@ public static void cleanup() {
       try {
         adminClient.close();
       } catch (RuntimeException e) {
-        System.err.println("Error closing AdminClient: " + e.getMessage());
+        logger.error("Error closing AdminClient: " + e.getMessage());
       }
     }
 
@@ -427,47 +427,47 @@ public static void cleanup() {
         kafkaConnect.stop();
       } catch (RuntimeException e) {
         // Log but don't fail cleanup
-        System.err.println("Error stopping Kafka Connect: " + e.getMessage());
+        logger.error("Error stopping Kafka Connect: " + e.getMessage());
       }
     }
 
     if (postgreSql != null) {
       try {
         postgreSql.stop();
       } catch (RuntimeException e) {
-        System.err.println("Error stopping PostgreSQL: " + e.getMessage());
+        logger.error("Error stopping PostgreSQL: " + e.getMessage());
       }
     }
 
     if (kafka != null) {
       try {
         kafka.stop();
       } catch (RuntimeException e) {
-        System.err.println("Error stopping Kafka: " + e.getMessage());
+        logger.error("Error stopping Kafka: " + e.getMessage());
       }
     }
 
     if (zookeeper != null) {
       try {
         zookeeper.stop();
       } catch (RuntimeException e) {
-        System.err.println("Error stopping Zookeeper: " + e.getMessage());
+        logger.error("Error stopping Zookeeper: " + e.getMessage());
       }
     }
 
     if (backend != null) {
       try {
         backend.stop();
       } catch (RuntimeException e) {
-        System.err.println("Error stopping backend: " + e.getMessage());
+        logger.error("Error stopping backend: " + e.getMessage());
       }
     }
 
     if (network != null) {
       try {
         network.close();
       } catch (RuntimeException e) {
-        System.err.println("Error closing network: " + e.getMessage());
+        logger.error("Error closing network: " + e.getMessage());
       }
     }
 
@@ -522,9 +522,9 @@ private static void setupSinkConnector(String topicName) throws IOException {
     // Remove this problematic cleanup code:
     // try (AdminClient adminClient = createAdminClient()) {
     //     adminClient.deleteTopics(Collections.singletonList(TOPIC_NAME)).all().get();
-    //     System.out.println("Deleted existing topic: " + TOPIC_NAME);
+    //     logger.info("Deleted existing topic: " + TOPIC_NAME);
     // } catch (e instanceof InterruptedException) {
-    //     System.out.println("Topic cleanup: " + e.getMessage());
+    //     logger.info("Topic cleanup: " + e.getMessage());
     // }
   }