Operator should set seccompProfile RuntimeDefault

[haslersn]

The operator should add

securityContext:
  seccompProfile:
    type: RuntimeDefault

to the spec of created Pods in order to be compatible with the Restricted policy of Pod Security Standards (previous to Kubernetes 1.22 where the SeccompDefault feature gate hits alpha).

[calind]

I don't understand all the implications right now, as I'm not up to date with Pod Security Standards. Can you try a PR and check that it still runs on k8s >= 1.19.

Thanks!