kOps: Add dashboards for Ubuntu 25.10 (Questing Quokka)

Author: hakman

config/testgrids/kubernetes/kops/config.yaml

@@ -22,6 +22,7 @@ dashboard_groups:
   - kops-distro-rocky9
   - kops-distro-u2204
   - kops-distro-u2404
+  - kops-distro-u2510
   - kops-distro-umini2404
   - kops-distro-cos105
   - kops-k8s-1.29
@@ -65,6 +66,7 @@ dashboards:
 - name: kops-distro-rocky9
 - name: kops-distro-u2204
 - name: kops-distro-u2404
+- name: kops-distro-u2510
 - name: kops-distro-umini2404
 - name: kops-distro-cos105
 - name: kops-k8s-1.29