[CI][ROCm] Add DSpark evals

[AndreasKaratzas]

Stacks on vllm-project#54817 and adds MI355 ROCm/AITER DSpark eval coverage for Kimi K3 and DeepSeek V4.

This complements rather than duplicates draft vllm-project#50519 by using the current lm_eval mirror, with DeepSeek on the required V2 runner and explicit AITER MoE path.

Full 1,319-question GSM8K runs passed on 4x MI355: Kimi accuracy 0.3283 with 5.008 mean acceptance, and DeepSeek accuracy 0.9431 with 4.455 mean acceptance.

Pre-commit, YAML/config validation, and pytest collection passed; this PR was prepared with OpenAI Codex assistance and reviewed by the submitter.

[github-actions]

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[AndreasKaratzas]

my agent just betrayed me