fix: revert closing operator when tests are finished

The problem is that if we close the operator then the delete events
never get handled and the finalizers are not removed leading to the
namespace never being deleted, thus failing the test…

Author: metacosm

operator-framework/src/test/java/io/javaoperatorsdk/operator/IntegrationTestSupport.java

@@ -132,8 +132,6 @@ public void teardownIfSuccess(TestRun test) {
     try {
       test.run();
 
-      operator.close();
-
       log.info("Deleting namespace {} and stopping operator", TEST_NAMESPACE);
       Namespace namespace = k8sClient.namespaces().withName(TEST_NAMESPACE).get();
       if (namespace.getStatus().getPhase().equals("Active")) {