add env vars to DO job templates and add tests

[mo-getter]

Rationale

Builds upon #583, exposing the NVIDIA env vars in the on-demand job templates, and adds unit tests.

Review Priority

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Changes

• ports the NVIDIA env var functionality from fix: detect gpu metrics in k8 gpu delegated-executor sidecars #583 to the on-demand DO jobs
• adds unit tests for both

Checklist

• This PR maintains parity between Docker Compose and Helm

Testing

make test-unit-helm

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