DeleteNamespace deletes all objects the tests typically create in the namespace.

This should only be used in e2e test, since integration test will not automatically create worker pods.

SetPodGroupsToReady set all podGroups of the leaderWorkerSet to ready state.

SetPodGroupToReady set one podGroup(leaderPod+workerStatefulset) of leaderWorkerSet to ready state, workerPods not included.

SetStatefulsetToUnReady set statefulset to unready.

ValidateLatestEvent will return true if the latest event is as you want.