allow override for noop

[benjibc]

Note

Introduce --ep-no-op-rollout-processor CLI flag and EP_USE_NO_OP_ROLLOUT_PROCESSOR env var to force NoOpRolloutProcessor, and update evaluation_test to honor this override; add tests.

• Pytest plugin (eval_protocol/pytest/plugin.py):
  • Add CLI flag --ep-no-op-rollout-processor that sets EP_USE_NO_OP_ROLLOUT_PROCESSOR=1.
• Decorator (eval_protocol/pytest/evaluation_test.py):
  • Honor EP_USE_NO_OP_ROLLOUT_PROCESSOR to use NoOpRolloutProcessor (overrides any provided processor); still defaults to NoOpRolloutProcessor when rollout_processor is None.
• Tests (tests/pytest/test_pytest_env_overwrite.py):
  • Add tests verifying env/flag override behavior and passthrough with NoOpRolloutProcessor, including multiple-row cases.

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