Enable separate rhos release args for compute nodes

[michburk]

Adds a var to the reproducer task where rhos release repos are installed, allowing the calling tasks to use different args from the cifmw_repo_setup_rhos_release_args.
Makes it possible for the compute nodes to run a separate rhel version from the hypervisor/controller-0 and use the correct rhos-release args for this different rhel version.

Note that downstream, many vars like cifmw_repo_setup_rhos_release_args are defined in some variable file like default-vars.yaml and passed to the ansible-playbook reproducer.yml ... invocation via -e. Since extravars have the highest precedence in ansible, it is impossible to overwrite these vars with other values, hence ugly variable overriding pattern.

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✔️ cifmw-crc-podified-edpm-baremetal SUCCESS in 1h 36m 14s
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