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.
```
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