Revert "add default try catch to evaluator function"

[mayinghan]

Reverts #297

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Note

Removes default try/except around execute_pytest in evaluation_test, letting exceptions surface, and drops the unused EvaluateResult import.

• Pytest evaluation runtime:
  • Remove error-wrapping try/except around execute_pytest in both pointwise and groupwise paths of eval_protocol/pytest/evaluation_test.py; directly await execute_pytest and validate return types.
• Models/Imports:
  • Drop EvaluateResult import from eval_protocol.models in evaluation_test.py.

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