Update AuthStatus to have list of ServiceAccountNames #2366

Job	Run time
Unit Test (knative/serving)	9m 43s
Unit Test (knative/networking)	3m 56s
Unit Test (knative/eventing)	13m 31s
Unit Test (knative/operator)	6m 35s
Unit Test (knative/client)	6m 43s
Unit Test (knative-extensions/eventing-autoscaler-keda)	4m 55s
Unit Test (knative-extensions/eventing-ceph)	4m 50s
Unit Test (knative-extensions/eventing-github)	5m 19s
Unit Test (knative-extensions/eventing-gitlab)	4m 54s
Unit Test (knative-extensions/eventing-kafka)	6m 37s
Unit Test (knative-extensions/eventing-kafka-broker)	11m 48s
Unit Test (knative-extensions/eventing-rabbitmq)	10m 23s
Unit Test (knative-extensions/eventing-redis)	5m 45s
Unit Test (knative-extensions/kn-plugin-admin)	4m 20s
Unit Test (knative-extensions/net-certmanager)	4m 11s
Unit Test (knative-extensions/net-contour)	4m 33s
Unit Test (knative-extensions/net-istio)	5m 42s
Unit Test (knative-extensions/net-kourier)	4m 24s
	1h 58m 9s

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