Fix the tests with same namespace name (#22240)

Author: Technoboy-

pulsar-broker/src/test/java/org/apache/pulsar/broker/transaction/TransactionTest.java

@@ -1664,7 +1664,7 @@ public void testGetTxnState() throws Exception {
 
     @Test
     public void testEncryptionRequired() throws Exception {
-        final String namespace = "tnx/ns-prechecks";
+        final String namespace = "tnx/testEncryptionRequired";
         final String topic = "persistent://" + namespace + "/test_transaction_topic";
         admin.namespaces().createNamespace(namespace);
         admin.namespaces().setEncryptionRequiredStatus(namespace, true);
@@ -1797,7 +1797,7 @@ private void getTopic(String topicName) {
 
     @Test
     public void testReadCommittedWithReadCompacted() throws Exception{
-        final String namespace = "tnx/ns-prechecks";
+        final String namespace = "tnx/testReadCommittedWithReadCompacted";
         final String topic = "persistent://" + namespace + "/test_transaction_topic";
         admin.namespaces().createNamespace(namespace);
         admin.topics().createNonPartitionedTopic(topic);
@@ -1853,7 +1853,7 @@ public void testReadCommittedWithReadCompacted() throws Exception{
 
     @Test
     public void testReadCommittedWithCompaction() throws Exception{
-        final String namespace = "tnx/ns-prechecks";
+        final String namespace = "tnx/testReadCommittedWithCompaction";
         final String topic = "persistent://" + namespace + "/test_transaction_topic" + UUID.randomUUID();
         admin.namespaces().createNamespace(namespace);
         admin.topics().createNonPartitionedTopic(topic);