chore: remove KAFKA_BROKER_CLUSTERRODE env var (#562)

Author: razvan

template/deploy/helm/[[operator]]/templates/deployment.yaml.j2

@@ -80,10 +80,6 @@ spec:
               value: {{ .Values.kubernetesClusterDomain | quote }}
             {{- end }}
             {{- include "telemetry.envVars" . | nindent 12 }}
-{[% if operator.product_string in ['kafka'] %}]
-            - name: KAFKA_BROKER_CLUSTERROLE
-              value: {{ include "operator.fullname" . }}-kafka-broker-clusterrole
-{[% endif %}]
 {[% if operator.product_string in ['opa'] %}]
             - name: OPA_BUNDLE_BUILDER_CLUSTERROLE
               value: {{ include "operator.fullname" . }}-opa-bundle-builder-clusterrole