Prepare repos and manifests in advance to be ready to switch to the RHEL 9.4:

• Timeline: https://pp.engineering.redhat.com/rhel/overview/
• Prepare the manifests changes for openshift/os
• Repos to add for 4.16-9.4: https://gitlab.cee.redhat.com/coreos/redhat-coreos
• Repos to add for 4.16-9.4: https://github.com/openshift/release/blob/master/core-services/release-controller/_repos/ocp-4.16-rhel92.repo
• Minor cleanup needed for the releases here as well for RHEL 8 repos no longer needed for RHCOS 4.13+