update sig-scalability-periodic-dra.yaml fix prometheus configs-2

Author: alaypatel07

config/jobs/kubernetes/sig-scalability/DRA/sig-scalability-periodic-dra.yaml

@@ -279,6 +279,7 @@ periodics:
             - --gcp-nodes=100
             - --provider=gce
             - --env=KUBE_FEATURE_GATES=DynamicResourceAllocation=true
+            - --env=KUBE_GCE_PRIVATE_CLUSTER=false
             - --runtime-config=api/all=true
             - --test=false
             - --test-cmd=$GOPATH/src/k8s.io/perf-tests/run-e2e.sh
@@ -310,6 +311,8 @@ periodics:
               value: "3s"
             - name: CL2_LONG_JOB_RUNNING_TIME
               value: "45m"
+            - name: CL2_PROMETHEUS_TOLERATE_MASTER
+              value: "true"
             - name: PROMETHEUS_SCRAPE_KUBELETS
               value: "true"
             - name: NODE_PRELOAD_IMAGES