Ignore abandoned nodes in the test since we just need to replace the transforms.

Author: tomstepp

sdks/java/io/kafka/src/test/java/org/apache/beam/sdk/io/kafka/KafkaReadWithRedistributeOverrideTest.java

@@ -128,5 +128,6 @@ public void leaveCompositeTransform(Node node) {
           }
         };
     p.traverseTopologically(visitor);
+    p.enableAbandonedNodeEnforcement(false);
   }
 }