Don't migrate storage version if CRD has one storage version #2154

Job	Run time
Unit Test (knative/serving)	9m 16s
Unit Test (knative/networking)	7m 37s
Unit Test (knative/eventing)	22m 1s
Unit Test (knative/operator)	11m 1s
Unit Test (knative/client)	13m 44s
Unit Test (knative-extensions/eventing-autoscaler-keda)	8m 3s
Unit Test (knative-extensions/eventing-ceph)	9m 19s
Unit Test (knative-extensions/eventing-github)	9m 33s
Unit Test (knative-extensions/eventing-gitlab)	7m 42s
Unit Test (knative-extensions/eventing-kafka)	11m 54s
Unit Test (knative-extensions/eventing-kafka-broker)	15m 21s
Unit Test (knative-extensions/eventing-rabbitmq)	16m 42s
Unit Test (knative-extensions/eventing-redis)	9m 0s
Unit Test (knative-extensions/kn-plugin-admin)	7m 14s
Unit Test (knative-extensions/net-certmanager)	6m 52s
Unit Test (knative-extensions/net-contour)	7m 53s
Unit Test (knative-extensions/net-http01)	6m 9s
Unit Test (knative-extensions/net-istio)	12m 6s
Unit Test (knative-extensions/net-kourier)	7m 58s
	3h 19m 25s

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