(dev-v2.6-archive) Add rewrite rule to Prometheus and Grafana for /k8s/clusters

(partially cherry picked from commit b93fe34e57)

packages/rancher-grafana/generated-changes/overlay/templates/nginx-config.yaml

@@ -70,6 +70,9 @@ data:
           if ($request_filename ~ .*\.(?:js|css|jpg|jpeg|gif|png|ico|cur|gz|svg|svgz|mp4|ogg|ogv|webm)$) {
             expires             90d;
           }
+
+          rewrite ^/k8s/clusters/.*/proxy(.*) /$1 break;
+
         }
       }
     }

packages/rancher-monitoring/generated-changes/overlay/templates/prometheus/nginx-config.yaml

@@ -61,6 +61,9 @@ data:
           if ($request_filename ~ .*\.(?:js|css|jpg|jpeg|gif|png|ico|cur|gz|svg|svgz|mp4|ogg|ogv|webm)$) {
             expires             90d;
           }
+
+          rewrite ^/k8s/clusters/.*/proxy(.*) /$1 break;
+
         }
       }
     }