Description of problem:
as title, delete subscription of etcd-operator, and the etcd-operator pods still exist in the project, it should be deleted.

ocp version: v3.11.0-0.10.0

How reproducible:
Always

Steps to Reproduce:
1. create subscription for etcd-operator 

apiVersion: app.coreos.com/v1alpha1
kind: Subscription-v1
metadata:
  name: etcd-test
  namespace: operator-lifecycle-manager
spec:
  channel: alpha
  name: etcd
  source: tectonic-ocs

2. After run some testcase, delete all etcd-operator stuff, then delete subscription:

#oc  delete endpoints etcd-operator
#oc  delete crd etcdclusters.etcd.database.coreos.com
#oc delete crd etcdbackups.etcd.database.coreos.com     
#oc  delete crd etcdrestores.etcd.database.coreos.com  

# oc delete -f etcd-subscription.yaml
subscription-v1.app.coreos.com "etcd-test" deleted

# oc delete pods etcd-operator-7b49974f5b-vnkqw

3. check the etcd-operator still exist

# oc get pods
NAME                                READY     STATUS    RESTARTS   AGE
alm-operator-657669cf6-g68p2        1/1       Running   0          7h
catalog-operator-5d7b55dc89-67qww   1/1       Running   0          7h
etcd-operator-7b49974f5b-vnkqw      3/3       Running   0          20m



Actual results:

Delete subscription, then delete etcd-pods, but pod still be rescheduled 

as title

Expected results:
Delete subscription, then delete etcd-pods, etcd-operator should non-exist