CD plugin: explore exposing `--nogpu` CLI arg for IMEX daemons

[jgehrcke]

See https://docs.nvidia.com/multi-node-nvlink-systems/imex-guide/gettingstarted.html#running-imex-in-no-gpu-mode

Does that mean that we could test some aspects of ComputeDomain orchestration in environments without GPUs? Even without GPU driver (probably not, we need some dev nodes to be present on the host)? Could it be useful for some users of our DRA driver?

Brought up by AWS / @RobertNorthard

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