ci: update polaris plugin version and add headlamp SA to RBAC

- Update headlamp-static-plugin-values.yaml to 0.7.2
- Add headlamp service account to polaris-dashboard-proxy-reader RoleBinding
- Update documentation references from headlamp-polaris-plugin to headlamp-polaris

Co-Authored-By: Paperclip <noreply@paperclip.ing>

docs/user-guide/rbac-permissions.md

@@ -35,7 +35,7 @@ metadata:
   name: polaris-proxy-reader
   namespace: polaris
   labels:
-    app.kubernetes.io/name: headlamp-polaris-plugin
+    app.kubernetes.io/name: headlamp-polaris
     app.kubernetes.io/component: rbac
 rules:
   - apiGroups: ['']
@@ -60,7 +60,7 @@ metadata:
   name: headlamp-polaris-proxy
   namespace: polaris
   labels:
-    app.kubernetes.io/name: headlamp-polaris-plugin
+    app.kubernetes.io/name: headlamp-polaris
     app.kubernetes.io/component: rbac
 subjects:
   - kind: ServiceAccount