Description of problem:

When openshift pipelines operator is installed, it installs a bunch of webhooks. Almost all of them, except for these 3:

• proxy.operator.tekton.dev
• validation.pipelinesascode.tekton.dev
• namespace.operator.tekton.dev
  have owner set to the namespace openshift-pipelines
  So if the operator is removed by removing the namespace, e.g. using ArgoCD, all webhooks but these 3 are properly removed.

Prerequisites (if any, like setup, operators/versions):

Steps to Reproduce

 # <steps>

Actual results: 3 mentioned Webhooks are not deleted.

Expected results: All Webhooks should be deleted.

Reproducibility (Always/Intermittent/Only Once): Always

Acceptance criteria: 

Definition of Done:

Build Details:

Additional info (Such as Logs, Screenshots, etc):

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