Add check to ensure that a pod has a pod security policy specified

[viswajithiii]

(Also validate that the PSP and security context are compatible. And in another check, perhaps validate that the PSP is as tight as possible based on the security context.)

[garethahealy]

is this a dead policy, since PSP are now deprecated?

• https://kubernetes.io/blog/2021/04/06/podsecuritypolicy-deprecation-past-present-and-future/

[viswajithiii]

Yeah, pretty much. We are not planning to do it unless a lot of people explicitly ask for it (which doesn't seem to be happening).