drop cluster-name flag for eks-pod-identity-sandbox

Validate kubernetes/kops#16217

Signed-off-by: Arnaud Meukam <ameukam@gmail.com>

config/jobs/kubernetes/sig-k8s-infra/periodics.yaml

@@ -241,7 +241,6 @@ periodics:
           --up --down \
           --cloud-provider=aws \
           --create-args="--image='136693071363/debian-12-amd64-20231013-1532' --channel=alpha --networking=cilium --discovery-store=s3://k8s-kops-ci-prow-sandbox/discovery" \
-          --cluster-name=e2e-kops-eks-sandbox-cilium-deb12.tests-kops-aws.k8s.io \
           --kops-version-marker=https://storage.googleapis.com/kops-ci/bin/latest-ci-updown-green.txt \
           --kubernetes-version=https://dl.k8s.io/release/stable.txt \
           --test=kops \
@@ -252,6 +251,8 @@ periodics:
       env:
       - name: DISCOVERY_STORE
         value: "s3://k8s-kops-ci-prow-sandbox"
+      - name: KOPS_DNS_DOMAIN
+        value: "tests-kops-aws.k8s.io"
       - name: KOPS_STATE_STORE
         value: "s3://k8s-kops-ci-prow-sandbox-state-store"
       - name: KUBE_SSH_KEY_PATH