Restructure GPQA Diamond evaluator section for JObject deserialization

[Copilot]

Refactors the evaluator section in gpqa_diamond/spec.yaml to support JObject deserialization in C# consumers. The evaluator configuration is now encapsulated in a testingCriteria field.

Changes

• Evaluator structure: Reduced to two fields: id and testingCriteria
• testingCriteria: Contains full evaluator config as a JSON-serializable object with snake_case keys:
  • evaluatorName → evaluator_name
  • version → evaluator_version
  • overrideInitParameterSchema → initialization_parameters
  • dataMappingSchema → data_mapping
• Version: Bumped from 1 to 2

New Structure

evaluator:
  id: "azureml://registries/azureml/evaluators/builtin.f1_score/versions/1"
  testingCriteria:
    type: "azure_ai_evaluator"
    name: "GPQA_Diamond"
    evaluator_name: "builtin.f1_score"
    evaluator_version: "1"
    initialization_parameters:
      threshold: 0.5
    data_mapping:
      response: "{{sample.output_text}}"
      ground_truth: "{{item.Correct_Answer}}"

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[github-actions]

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