test(e2e): skip docker gpu test in rust suite

[pimlock]

Summary

Skip the Docker GPU smoke test when running the regular Rust e2e suite. We will need to add a dedicated test for this in our E2E-GPU workflow.

Fixes failing E2E workflows on main: https://github.com/NVIDIA/OpenShell/actions/runs/25196530420/job/73879135082

Related Issue

N/A

Changes

• Add docker_gpu_sandbox_runs_nvidia_smi to the regular e2e:rust Cargo skip list.
• Update the comment for dedicated e2e tests to include Docker GPU coverage.

Testing

• mise run pre-commit passes
• Unit tests added/updated
• E2E tests added/updated (if applicable)

Additional testing:

• cargo test --manifest-path e2e/rust/Cargo.toml --features e2e --no-run
• cargo test --manifest-path e2e/rust/Cargo.toml --features e2e --test docker_gpu --no-run
• cargo test --manifest-path e2e/rust/Cargo.toml --features e2e --test docker_gpu -- --skip docker_gpu_sandbox_runs_nvidia_smi

Note: mise run pre-commit was attempted. Rust tests passed, but license:check failed on the pre-existing untracked file test-policy.yaml missing SPDX headers; this PR does not touch that file.

Checklist

• Follows Conventional Commits
• Commits are signed off (DCO)
• Architecture docs updated (if applicable)