normalize in rollout processors

[xzrderek]

Note

Introduces consistent model ID normalization for Fireworks when routing via LiteLLM and applies it across rollout processors.

• Adds normalize_fireworks_model_for_litellm in pytest/utils.py; removes old normalize_fireworks_model from evaluation_test_utils.py
• Applies normalization and sets row.input_metadata.completion_params (and config.completion_params where used) in default_agent_rollout_processor.py, default_single_turn_rollout_process.py, default_mcp_gym_rollout_processor.py, default_klavis_sandbox_rollout_processor.py, openenv_rollout_processor.py, remote_rollout_processor.py, and github_action_rollout_processor.py
• Ensures policies and requests use normalized model/params; minor style/typing cleanups (e.g., pyright ignores)

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