Problem
Kafka Broker does not currently support cross namespace triggers

Persona:
Event Consumer - Development teams trying to manage their own triggers/consumer groups

Exit Criteria
We can create a Trigger for a Kafka Broker in a namespace other than the Broker namespace and reconciliation of the Trigger/CG etc succeeds.

Had a quick scan/search of the issues and code base but couldn't find anything discussing this. For reference I'm talking about this BrokerRef field in the Trigger

type TriggerSpec struct {
	// Broker is the broker that this trigger receives events from.
	Broker string `json:"broker,omitempty"`

	// BrokerRef is the broker that is used for cross-namespace referencing.
	BrokerRef *duckv1.KReference `json:"brokerRef,omitempty"`

https://knative.dev/docs/eventing/features/cross-namespace-event-links/