Use istio.sidecar.inject label instead of annotation #2449

Job	Run time
Unit Test (knative/serving)	9m 54s
Unit Test (knative/networking)	3m 54s
Unit Test (knative/eventing)	12m 18s
Unit Test (knative/operator)	6m 42s
Unit Test (knative/client)	6m 48s
Unit Test (knative-extensions/eventing-autoscaler-keda)	4m 53s
Unit Test (knative-extensions/eventing-ceph)	5m 6s
Unit Test (knative-extensions/eventing-github)	5m 32s
Unit Test (knative-extensions/eventing-gitlab)	5m 12s
Unit Test (knative-extensions/eventing-kafka-broker)	8m 54s
Unit Test (knative-extensions/eventing-rabbitmq)	4m 55s
Unit Test (knative-extensions/eventing-redis)	5m 23s
Unit Test (knative-extensions/kn-plugin-admin)	14m 13s
Unit Test (knative-extensions/net-certmanager)	4m 27s
Unit Test (knative-extensions/net-contour)	4m 57s
Unit Test (knative-extensions/net-istio)	5m 13s
Unit Test (knative-extensions/net-kourier)	4m 49s
	1h 53m 10s

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