USHIFT-6951: Add standalone cluster-monitoring-operator rebase script

Move kube-state-metrics rebase logic out of shared assets.yaml/rebase.sh into
rebase_cluster_monitoring_operator.sh with a matching assets recipe. The script
is identical across sibling PRs (openshift#6808, openshift#6809, openshift#6810) to simplify merging the
three optional monitoring components.

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: copejon

scripts/auto-rebase/assets_cluster_monitoring_operator.yaml

@@ -35,3 +35,16 @@ assets:
         ignore: "gets generated during image rebase"
       - file: release-metrics-server-aarch64.json
         ignore: "gets generated during image rebase"
+  - dir: optional/kube-state-metrics/
+      no_clean: True
+      src: cluster-monitoring-operator/assets/kube-state-metrics/
+        - file: 01-service-account.yaml
+          src: service-account.yaml
+        - file: 02-custom-resource-state-configmap.yaml
+          src: custom-resource-state-configmap.yaml
+        - file: 02-kube-rbac-proxy-secret.yaml
+          src: kube-rbac-proxy-secret.yaml
+        - file: release-kube-state-metrics-x86_64.json
+          ignore: "gets generated during image rebase"
+        - file: release-kube-state-metrics-aarch64.json
+          ignore: "gets generated during image rebase"