e2e/kubemacpool: Set monitoring lane env var

Doing so tells CNAO to configure the monitoring components using the
correct prometheus ns

Signed-off-by: Ram Lavi <ralavi@redhat.com>

Author: RamLavi

automation/check-patch.e2e-kubemacpool-functests.sh

@@ -24,6 +24,7 @@ main() {
     cd ${TMP_PROJECT_PATH}
 
     export KUBEVIRT_NUM_NODES=${KUBEVIRT_NUM_NODES:-3}
+    export MONITORING_NAMESPACE="monitoring"
     # Spin-up ephemeral cluster with latest CNAO
     # this script also exports KUBECONFIG, and fetch $COMPONENT repository
     export CNAO_DEPLOY_KUBEVIRT=true