Send events from pipeline to the listener

Stop sending events to kafka, send them directly to the listener.
Next step will be to deprovision the kafka cluster, to help
reducing infra costs.

Partially-fixes: tektoncd#2156

Signed-off-by: Andrea Frittoli <[email protected]>

tekton/cd/pipeline/overlays/dogfooding/config-defaults.yaml

@@ -4,4 +4,4 @@ metadata:
   name: config-defaults
   namespace: tekton-pipelines
 data:
-  default-cloud-events-sink: http://kafka-broker-ingress.knative-eventing.svc.cluster.local/default/default
+  default-cloud-events-sink: http://el-tekton-events.default:8080