Improve support for cri-o (peer-pods use case)

[beraldoleal]

Describe the bug
When using the operator to deploy peer-pods in a cri-o cluster, ccruntime-per-pods (as provided at samples folder) will fail because preInstall scripts are not ready for cri-o environments. Also the same sample uses :

- patch: |-
    - op: replace
      path: /spec/config/runtimeClasses
      value:
      - name: "kata-remote"
        snapshotter: "nydus"

Which is assuming containerd.

To Reproduce

1. Install a cluster with crio.
2. kubectl apply -k https://github.com/confidential-containers/operator/config/default
3. kubectl apply -k https://github.com/confidential-containers/operator/config/samples/ccruntime/peer-pods

Describe the results you expected
No errors.

Describe the results you received:

$ kubectl logs pod/cc-operator-pre-install-daemon-nmmhs -n confidential-containers-system
INSTALL_COCO_CONTAINERD: false
INSTALL_OFFICIAL_CONTAINERD: false
INSTALL_VFIO_GPU_CONTAINERD: false
INSTALL_NYDUS_SNAPSHOTTER: true
ERROR: cri-o is not yet supported

[wainersm]

This support has been added in #376