drop http01 from downstream testing #2274

Job	Run time
Unit Test (knative/serving)	10m 16s
Unit Test (knative/networking)	4m 18s
Unit Test (knative/eventing)	13m 32s
Unit Test (knative/operator)	6m 52s
Unit Test (knative/client)	3m 42s
Unit Test (knative-extensions/eventing-autoscaler-keda)	5m 10s
Unit Test (knative-extensions/eventing-ceph)	5m 6s
Unit Test (knative-extensions/eventing-github)	5m 40s
Unit Test (knative-extensions/eventing-gitlab)	5m 9s
Unit Test (knative-extensions/eventing-kafka)	7m 24s
Unit Test (knative-extensions/eventing-kafka-broker)	9m 51s
Unit Test (knative-extensions/eventing-rabbitmq)	11m 22s
Unit Test (knative-extensions/eventing-redis)	6m 39s
Unit Test (knative-extensions/kn-plugin-admin)	2m 39s
Unit Test (knative-extensions/net-certmanager)	5m 8s
Unit Test (knative-extensions/net-contour)	4m 50s
Unit Test (knative-extensions/net-istio)	6m 21s
Unit Test (knative-extensions/net-kourier)	4m 47s
	1h 58m 46s

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