tests: k8s-policy-rc: remove default UID from YAML

The nginx container seems to error out when using UID=123.

Depending on the timing between container initialization and "kubectl
wait", the test might have gotten lucky and found the pod briefly in
Ready state before nginx errored out. But on some of the nodes, the pod
never got reported as Ready.

Also, don't block in "kubectl wait --for=condition=Ready" when wrapping
that command in a waitForProcess call, because waitForProcess is
designed for short-lived commands.

Signed-off-by: Dan Mihai <dmihai@microsoft.com>

tests/integration/kubernetes/runtimeclass_workloads/k8s-policy-rc.yaml

@@ -17,8 +17,6 @@ spec:
       labels:
         app: policy-nginx-rc
     spec:
-      securityContext:
-        runAsUser: 123
       terminationGracePeriodSeconds: 0
       runtimeClassName: kata
       containers: