Image Registry Pull through does not support IDMS/ITMS

Pull-through only checks for ICSP, ignoring IDMS/ITMS.

Always

1. Create an IDMS/ITMS rule (TODO: add specifics)
example IDMS/ITMS specifics:  

apiVersion: config.openshift.io/v1
kind: ImageDigestMirrorSet
metadata:
  name: digest-mirror
spec:
  imageDigestMirrors:
  - mirrors:
    - registry.access.redhat.com/ubi8/ubi-minimal
    source: quay.io/podman/hello
    mirrorSourcePolicy: NeverContactSource

apiVersion: config.openshift.io/v1
kind: ImageTagMirrorSet
metadata:
  name: tag-mirror
spec:
  imageTagMirrors:
  - mirrors:
    - registry.access.redhat.com/ubi8/ubi-minimal
    source: quay.io/podman/hello
    mirrorSourcePolicy: NeverContactSource

2. Create an image stream with `referencePolicy: local`. Example: https://gist.github.com/flavianmissi/0518239edd6f51d54b5633212f2b2ac9 
3. Pull the image from the image stream created above. Example `oc new-app test-1:latest`