[edpm_baremetal_update] Add compute node reboot after minor update

[rebtoor]

Implement the missing Chapter 4 (Rebooting Compute nodes) of the RHOSO 18.0 minor update procedure. Without a reboot, nova-compute may retain stale state after the control plane update and fail to re-register the hypervisor, causing "No valid host was found" errors in post-update Tempest tests.

Reference: https://docs.redhat.com/en/documentation/red_hat_openstack_services_on_openshift/18.0/html-single/updating_your_environment_to_the_latest_maintenance_release/index#rebooting-compute-nodes_updating

[openshift-ci]

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✔️ openstack-k8s-operators-content-provider SUCCESS in 2h 07m 03s
✔️ podified-multinode-edpm-deployment-crc SUCCESS in 1h 22m 53s
✔️ cifmw-crc-podified-edpm-baremetal SUCCESS in 1h 28m 00s
❌ cifmw-crc-podified-edpm-baremetal-minor-update FAILURE in 1h 53m 25s
✔️ noop SUCCESS in 0s
✔️ cifmw-pod-ansible-test SUCCESS in 8m 26s
✔️ cifmw-pod-pre-commit SUCCESS in 8m 26s