drop eventing-rabbitmq downstream testing #2275

Job	Run time
Unit Test (knative/serving)	10m 10s
Unit Test (knative/networking)	4m 19s
Unit Test (knative/eventing)	13m 28s
Unit Test (knative/operator)	6m 57s
Unit Test (knative/client)	3m 38s
Unit Test (knative-extensions/eventing-autoscaler-keda)	5m 3s
Unit Test (knative-extensions/eventing-ceph)	5m 5s
Unit Test (knative-extensions/eventing-github)	5m 35s
Unit Test (knative-extensions/eventing-gitlab)	5m 15s
Unit Test (knative-extensions/eventing-kafka)	7m 0s
Unit Test (knative-extensions/eventing-kafka-broker)	10m 13s
Unit Test (knative-extensions/eventing-redis)	6m 17s
Unit Test (knative-extensions/kn-plugin-admin)	2m 44s
Unit Test (knative-extensions/net-certmanager)	4m 39s
Unit Test (knative-extensions/net-contour)	4m 50s
Unit Test (knative-extensions/net-http01)	4m 7s
Unit Test (knative-extensions/net-istio)	6m 24s
Unit Test (knative-extensions/net-kourier)	4m 39s
	1h 50m 23s

Provide feedback