Honour explicit requests to not install the NVIDIA GPU Operator

[yankcrime]

Right now, Unikorn Server's decision as to whether to install the Operator or not is final as far as the resulting Kubernetes cluster spec is concerned, based on whether GPUs are detected in any workload pools.

This change checks for an explicit disabling of said Operator in the creation request, and if set does not install regardless of whether GPUs are available.

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (main@66329b8). Click here to learn what that means. The diff coverage is n/a.

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