[release-1.16] Fix `WEBHOOK_DISABLE_NAMESPACE_OWNERSHIP` env-var #2461

Job	Run time
Unit Test (knative/serving)	10m 40s
Unit Test (knative/networking)	5m 31s
Unit Test (knative/eventing)	13m 0s
Unit Test (knative/operator)	8m 0s
Unit Test (knative/client)	7m 44s
Unit Test (knative-extensions/eventing-autoscaler-keda)	5m 58s
Unit Test (knative-extensions/eventing-ceph)	6m 35s
Unit Test (knative-extensions/eventing-github)	6m 55s
Unit Test (knative-extensions/eventing-gitlab)	6m 31s
Unit Test (knative-extensions/eventing-kafka-broker)	10m 36s
Unit Test (knative-extensions/eventing-rabbitmq)	9m 29s
Unit Test (knative-extensions/eventing-redis)	6m 31s
Unit Test (knative-extensions/kn-plugin-admin)	15m 24s
Unit Test (knative-extensions/net-certmanager)	5m 30s
Unit Test (knative-extensions/net-contour)	6m 26s
Unit Test (knative-extensions/net-istio)	6m 18s
Unit Test (knative-extensions/net-kourier)	5m 27s
	2h 16m 35s

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