Enable Mixed RHEL for va-hci OCP and Compute Nodes

[sathlan]

We have introduced two new variables, cifmw_compute_image_url and
cifmw_compute_hash, to enable selecting a different image for
the compute nodes and OCP cluster. This change supports testing
updates after adoption, as the compute nodes remain on version 9.2
post-adoption.

Part of: (OSPRH-22469)[https://issues.redhat.com/browse/OSPRH-22469]

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[softwarefactory-project-zuul]

Build failed (check pipeline). Post recheck (without leading slash)
to rerun all jobs. Make sure the failure cause has been resolved before
you rerun jobs.

https://softwarefactory-project.io/zuul/t/rdoproject.org/buildset/58dbcbc4513d448dbc4ee03936f93ad9

✔️ openstack-k8s-operators-content-provider SUCCESS in 1h 50m 49s
❌ podified-multinode-edpm-deployment-crc FAILURE in 35m 59s
❌ cifmw-crc-podified-edpm-baremetal NODE_FAILURE Node request 099-0008116989 failed in 0s
❌ cifmw-crc-podified-edpm-baremetal-minor-update FAILURE in 1h 28m 10s
✔️ noop SUCCESS in 0s
✔️ cifmw-pod-ansible-test SUCCESS in 8m 37s
✔️ cifmw-pod-pre-commit SUCCESS in 8m 06s
✔️ build-push-container-cifmw-client SUCCESS in 24m 14s

[softwarefactory-project-zuul]

Build failed (check pipeline). Post recheck (without leading slash)
to rerun all jobs. Make sure the failure cause has been resolved before
you rerun jobs.

https://softwarefactory-project.io/zuul/t/rdoproject.org/buildset/edf49b95878a47749d5d3d243f407422

✔️ openstack-k8s-operators-content-provider SUCCESS in 1h 08m 32s
❌ podified-multinode-edpm-deployment-crc FAILURE in 36m 42s
❌ cifmw-crc-podified-edpm-baremetal FAILURE in 46m 23s
❌ cifmw-crc-podified-edpm-baremetal-minor-update FAILURE in 18m 55s
✔️ noop SUCCESS in 0s
✔️ cifmw-pod-ansible-test SUCCESS in 8m 32s
✔️ cifmw-pod-pre-commit SUCCESS in 8m 10s
❌ build-push-container-cifmw-client FAILURE in 25m 57s