Remove the node selector for (new) vpa test

This is no longer used and causes the test to fail as of
#6291

PiperOrigin-RevId: 844748186

Author: p3rf Team

perfkitbenchmarker/data/container/kubernetes_vpa/fib.yaml.j2

@@ -33,10 +33,6 @@ spec:
             - containerPort: {{ port }}
               name: "web"
               protocol: "TCP"
-      nodeSelector:
-        {%- for node_selector in node_selectors %}
-        {{node_selector}}
-        {%- endfor %}
 ---
 apiVersion: autoscaling.k8s.io/v1
 kind: VerticalPodAutoscaler