Merge pull request #34648 from nikhiljindal/NSCasDel

Automatic merge from submit-queue

Adding cascading deletion support to federated namespaces

Ref https://github.com/kubernetes/kubernetes/issues/33612

With this change, whenever a federated namespace is deleted with `DeleteOptions.OrphanDependents = false`, then federation namespace controller first deletes the corresponding namespaces from all underlying clusters before deleting the federated namespace.

cc @kubernetes/sig-cluster-federation @caesarxuchao


```release-note
Adding support for DeleteOptions.OrphanDependents for federated namespaces. Setting it to false while deleting a federated namespace also deletes the corresponding namespace from all registered clusters.
```

test/e2e/framework/util.go

@@ -2219,6 +2219,7 @@ func DumpEventsInNamespace(eventsLister EventsLister, namespace string) {
 	events, err := eventsLister(v1.ListOptions{}, namespace)
 	Expect(err).NotTo(HaveOccurred())
 
+	By(fmt.Sprintf("Found %d events.", len(events.Items)))
 	// Sort events by their first timestamp
 	sortedEvents := events.Items
 	if len(sortedEvents) > 1 {