Epic Goal
Align with the preference to platform: external and remove support for platform:none
Doc https://docs.google.com/document/d/1emH4dD75Gne47eW0prjuSjM0D_IkHP1UFRekFIG5SDE/edit?tab=t.0
Why is this important?
1. Update https://github.com/ocp-power-automation/ocp4-playbooks/blob/main/playbooks/roles/ocp-config/templates/install-config.yaml.j2#L24 for UPI automation2. Update Power MultiArch Refs in release https://github.com/search?q=repo%3Aopenshift%2Frelease+platform%3A+none&type=code&p=2 in test infra
3. Update Playbooks the UPI playbooks use platform:none, they need to be changed to new platform:external.
4. in CI, UPI libvirt install use "platform:none"
> https://github.com/openshift/release/blob/master/ci-operator/step-registry/upi/libvirt/conf/upi-libvirt-conf-commands.sh#L39
> In origin repo also we have NonePlatform that might also get affected.
5. Notify channels for Power Users