Add 2no-ha extension support required by Two Node OpenShift

[fabbione]

See: https://issues.redhat.com/browse/OCPEDGE-1493

- Description for the changelog

Add 2no-ha extension support required by Two Node OpenShift

[openshift-ci]

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[openshift-ci]

Hi @fabbione. Thanks for your PR.

I'm waiting for a openshift member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[fabbione]

Hey guys,

very first time contributing to RHCOS, I am sure I missed a few bits here and there, hopefully not too many :)

the name 2no-ha was explicity selected to avoid using HighAvailability as in the context of OpenShift could
be misleading. The RHEL HighAvailability channel provides the packages required for Two Nodes OpenShift
controller plane deployments.

See also:
https://gitlab.cee.redhat.com/coreos/redhat-coreos/-/merge_requests/1553
openshift/os#1743
#4843
openshift-eng/ocp-build-data#6091
openshift/release#61519

[fabbione]

As noted in openshift/os#1743 (review) I will rename 2no-ha to two-node-ha. I will update this PR as well tomorrow.

[fabbione]

Rename from 2no-ha to two-node-ha is done.