[FLINK-28648][Flink-Kubernetes-Operator] Changed getUnManagedJobs -> getNonTerminated + annotated @VisibleForTesting

Author: nishita-pattanayak

flink-kubernetes-operator/src/main/java/org/apache/flink/kubernetes/operator/reconciler/deployment/SessionReconciler.java

@@ -147,8 +147,7 @@ Set<JobID> getNonTerminalJobs(FlinkResourceContext<FlinkDeployment> ctx) {
                             .get()
                             .getJobs();
 
-            // running
-            // Above terminal states are not considered since they are no longer active jobs
+            // running job Ids
             Set<JobID> nonTerminalJobIds =
                     allJobs.stream()
                             .filter(job -> !job.getStatus().isGloballyTerminalState())