Fix flaky-test: KafkaNonPartitionedTopicTest.testNonPartitionedTopic (#1853)

Fix: #1852

### Motivation

When the topic has an active producer or consumer, then we are not able
to delete the topic by using `admin.topics().delete(topic)`, we should
force delete it.

### Modifications

Use the force option to delete the topic in the test.

(cherry picked from commit c3336be)

Author: Demogorgon314

tests/src/test/java/io/streamnative/pulsar/handlers/kop/KafkaNonPartitionedTopicTest.java

@@ -101,7 +101,7 @@ public void testNonPartitionedTopic() throws PulsarAdminException {
                     .getConsumer().listTopics(Duration.ofSeconds(1));
             assertEquals(result.size(), 1);
         } finally {
-            admin.topics().delete(topic);
+            admin.topics().delete(topic, true);
         }
     }