Cleanup is not deleting webhooks

[kameshsampath]

Bug Description

I installed istio by istioctl install --set profile=default and when I uninstalled the same following the steps https://istio.io/latest/docs/setup/install/operator/#uninstall, I still see the webhooks left over after cleanup. This is causing an issue when trying to do a new revision based install on the same cluster.

Version

`istioctl version`
1.12.1
`kubectl version`
Client Version: v1.22.5
Server Version: v1.21.8+k3s1

Additional Information

After cleanup listing the webhooks on the cluster

➜  k get mutatingwebhookconfigurations.admissionregistration.k8s.io,validatingwebhookconfigurations.admissionregistration.k8s.io --show-labels
NAME                                                                                   WEBHOOKS   AGE   LABELS
mutatingwebhookconfiguration.admissionregistration.k8s.io/istio-revision-tag-default   4          91m   app=sidecar-injector,install.operator.istio.io/owning-resource=unknown,istio.io/rev=default,istio.io/tag=default,operator.istio.io/component=Pilot,release=istio

NAME                                                                                   WEBHOOKS   AGE   LABELS
validatingwebhookconfiguration.admissionregistration.k8s.io/istiod-default-validator   1          91m   app=istiod,istio.io/rev=default,istio.io/tag=default,istio=istiod,operator.istio.io/component=Pilot

[kameshsampath]

CC: @nrjpoddar @rinormaloku

[keithmattix]

I'm running into this as well

[istio-policy-bot]

🚧 This issue or pull request has been closed due to not having had activity from an Istio team member since 2022-01-20. If you feel this issue or pull request deserves attention, please reopen the issue. Please see this wiki page for more information. Thank you for your contributions.

Created by the issue and PR lifecycle manager.