feat: add MiniMax M2.7 support

[jQizhang]

What does this PR do ?

Adds MiniMax M2.7 support for the Automodel DAPO/GRPO workflow.
Related issue: #2251

Summary of code changes:

• nemo_rl/models/generation/vllm/quantization/fp8.py - update the vLLM FP8 Ray executor import path used by the local FP8 patching hook.
• nemo_rl/models/policy/workers/dtensor_policy_worker_v2.py - call the optional Automodel MoE gate-bias update hook after each optimizer step.
• examples/configs/recipes/llm/grpo-minimax-m27-dapo-8n8g-automodel.yaml - add an 8-node, 8-GPU MiniMax M2.7 DAPO recipe using Automodel, vLLM FP8 rollouts, and the DAPOMath datasets.

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[sharonyu-115]

/ok to test cb0ff8c

[jQizhang]

/ok to test 05caacb

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/ok to test 05caacb

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[jQizhang]

/ok to test 8cf2fa6