Furing FFWD workflow, the validation gets triggered as part of the
pre-upgrade group. When it gets triggered, the environment is in
state where the Undercloud has been upgrade to OSP16.1 (container
engine is podman) but the Overcloud nodes are still on OSP13
(container engine is still docker).
This patch is similar to I46c4fbe0ef7b281d77bff82483eb0b48b4570bb3
to check which container cli should be used.