[test] Fix TestDeleteStoreDeletesRealtimeTopic for correctness (#701)

This commit addresses a potential issue with resource management in `TestDeleteStoreDeletesRealtimeTopic`.  
The previous code prematurely closed the `TopicManagerRepository` within a try-with-resources block,  
causing early closure of internal topic managers and its associated PubSub clients. 

To resolve this, we close the `TopicManagerRepository` only when its local topic manager is no
longer required. This change ensures proper resource management.

internal/venice-test-common/src/integrationTest/java/com/linkedin/venice/controller/TestDeleteStoreDeletesRealtimeTopic.java

@@ -5,6 +5,7 @@
 import static com.linkedin.venice.utils.IntegrationTestPushUtils.makeStoreHybrid;
 import static com.linkedin.venice.utils.IntegrationTestPushUtils.sendStreamingRecord;
 import static org.testng.Assert.assertEquals;
+import static org.testng.Assert.assertTrue;
 
 import com.linkedin.venice.client.store.AvroGenericStoreClient;
 import com.linkedin.venice.client.store.ClientConfig;
@@ -15,7 +16,6 @@
 import com.linkedin.venice.exceptions.VeniceException;
 import com.linkedin.venice.integration.utils.ServiceFactory;
 import com.linkedin.venice.integration.utils.VeniceClusterWrapper;
-import com.linkedin.venice.kafka.TopicManager;
 import com.linkedin.venice.kafka.TopicManagerRepository;
 import com.linkedin.venice.meta.Version;
 import com.linkedin.venice.pubsub.PubSubTopicRepository;
@@ -42,26 +42,22 @@ public class TestDeleteStoreDeletesRealtimeTopic {
   private VeniceClusterWrapper venice = null;
   private AvroGenericStoreClient client = null;
   private ControllerClient controllerClient = null;
-  private TopicManager topicManager = null;
+  private TopicManagerRepository topicManagerRepository = null;
   private String storeName = null;
 
-  private PubSubTopicRepository pubSubTopicRepository = new PubSubTopicRepository();
+  private final PubSubTopicRepository pubSubTopicRepository = new PubSubTopicRepository();
 
   @BeforeClass
   public void setUp() {
     venice = ServiceFactory.getVeniceCluster();
     controllerClient =
         ControllerClient.constructClusterControllerClient(venice.getClusterName(), venice.getRandomRouterURL());
-
-    try (TopicManagerRepository topicManagerRepository = IntegrationTestPushUtils.getTopicManagerRepo(
+    topicManagerRepository = IntegrationTestPushUtils.getTopicManagerRepo(
         DEFAULT_KAFKA_OPERATION_TIMEOUT_MS,
         100,
         0l,
         venice.getPubSubBrokerWrapper(),
-        pubSubTopicRepository)) {
-      topicManager = topicManagerRepository.getTopicManager();
-    }
-
+        pubSubTopicRepository);
     storeName = Utils.getUniqueString("hybrid-store");
     venice.getNewStore(storeName);
     makeStoreHybrid(venice, storeName, 100L, 5L);
@@ -71,7 +67,7 @@ public void setUp() {
 
   @AfterClass
   public void cleanUp() {
-    Utils.closeQuietlyWithErrorLogged(topicManager);
+    Utils.closeQuietlyWithErrorLogged(topicManagerRepository);
     Utils.closeQuietlyWithErrorLogged(client);
     Utils.closeQuietlyWithErrorLogged(venice);
     Utils.closeQuietlyWithErrorLogged(controllerClient);
@@ -109,7 +105,7 @@ public void deletingHybridStoreDeletesRealtimeTopic() {
 
     // verify realtime topic exists
     PubSubTopic rtTopic = pubSubTopicRepository.getTopic(Version.composeRealTimeTopic(storeName));
-    Assert.assertTrue(topicManager.containsTopicAndAllPartitionsAreOnline(rtTopic));
+    assertTrue(topicManagerRepository.getTopicManager().containsTopicAndAllPartitionsAreOnline(rtTopic));
 
     // disable store
     TestUtils.assertCommand(
@@ -130,11 +126,11 @@ public void deletingHybridStoreDeletesRealtimeTopic() {
     // verify realtime topic does not exist
     PubSubTopic realTimeTopicName = pubSubTopicRepository.getTopic(Version.composeRealTimeTopic(storeName));
     try {
-      boolean isTruncated = topicManager.isTopicTruncated(realTimeTopicName, 60000);
-      Assert.assertTrue(
+      boolean isTruncated = topicManagerRepository.getTopicManager().isTopicTruncated(realTimeTopicName, 60000);
+      assertTrue(
           isTruncated,
           "Real-time buffer topic should be truncated: " + realTimeTopicName + " but retention is set to: "
-              + topicManager.getTopicRetention(realTimeTopicName) + ".");
+              + topicManagerRepository.getTopicManager().getTopicRetention(realTimeTopicName) + ".");
       LOGGER.info("Confirmed truncation of real-time topic: {}", realTimeTopicName);
     } catch (PubSubTopicDoesNotExistException e) {
       LOGGER