Change extract_images.sh to include Model Registry (kubeflow#2733)

Signed-off-by: Ricardo M. Oliveira <rmartine@redhat.com>

hack/extract_images.sh

@@ -18,6 +18,7 @@ declare -A wg_dirs=(
   [manifests]="../common/cert-manager/cert-manager/base ../common/cert-manager/kubeflow-issuer/base ../common/istio-1-22/istio-crds/base ../common/istio-1-22/istio-namespace/base ../common/istio-1-22/istio-install/overlays/oauth2-proxy ../common/oidc-client/oauth2-proxy/overlays/m2m-self-signed ../common/dex/overlays/oauth2-proxy ../common/knative/knative-serving/overlays/gateways ../common/knative/knative-eventing/base ../common/istio-1-22/cluster-local-gateway/base ../common/kubeflow-namespace/base ../common/kubeflow-roles/base ../common/istio-1-22/kubeflow-istio-resources/base"
   [workbenches]="../apps/pvcviewer-controller/upstream/base ../apps/admission-webhook/upstream/overlays ../apps/centraldashboard/upstream/overlays/oauth2-proxy ../apps/jupyter/jupyter-web-app/upstream/overlays ../apps/volumes-web-app/upstream/overlays ../apps/tensorboard/tensorboards-web-app/upstream/overlays ../apps/profiles/upstream/overlays ../apps/jupyter/notebook-controller/upstream/overlays ../apps/tensorboard/tensorboard-controller/upstream/overlays"
   [serving]="../contrib/kserve - ../contrib/kserve/models-web-app/overlays/kubeflow"
+  [model-registry]="../apps/model-registry/upstream"
 )
 
 save_images() {