Only install PodSecurityPolicies if the API is present

[caseydavenport]

Description

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

PodSecurityPolicy has been deprecated, and is scheduled to be removed
completely in Kubernetes v1.25. We want to remove them from our product
sufficiently early so that upgrades to v1.25 are not impacted on older
releases.

Replaced with Pod Security Standards: https://kubernetes.io/docs/concepts/security/pod-security-standards/

Useful translation guide: https://kubernetes.io/docs/reference/access-authn-authz/psp-to-pod-security-standards/

For PR author

• Tests for change.
• If changing pkg/apis/, run make gen-files
• If changing versions, run make gen-versions

For PR reviewers

A note for code reviewers - all pull requests must have the following:

• Milestone set according to targeted release.
• Appropriate labels:
  • kind/bug if this is a bugfix.
  • kind/enhancement if this is a a new feature.
  • enterprise if this PR applies to Calico Enterprise only.

[rene-dekker]

lgtm