Add AOAI result properties support

[ahmad-nader]

Description

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Summary

Adds support for routing nonstandard custom_... evaluator outputs into the AOAI result properties bag during evaluation result conversion.

What changed

• added properties support to AOAI result construction
• routed nonstandard custom_... keys into properties
• kept standard custom suffix keys such as custom_score, custom_reason, custom_threshold, and custom_label mapped to the normal AOAI top-level fields
• ensured custom-prefixed keys can still attach to the single expected metric when an evaluator exposes one metric
• added unit coverage in test_convert_results_to_aoai_evaluation_results

Example

Input keys like:

• outputs.friendly_evaluator_gh4y.custom_score
• outputs.friendly_evaluator_gh4y.custom_reason
• outputs.friendly_evaluator_gh4y.custom_threshold
• outputs.friendly_evaluator_gh4y.custom_label
• outputs.friendly_evaluator_gh4y.custom_observation_flag

now produce an AOAI result where:

• score, reason, threshold, and label stay in their standard fields
• custom_observation_flag is emitted under properties as observation_flag

Validation

Ran:

python -m pytest sdk/evaluation/azure-ai-evaluation/tests/unittests/test_evaluate.py::TestEvaluate::test_convert_results_to_aoai_evaluation_results -q

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[Copilot]

Pull request overview

This PR extends the evaluation-result conversion pipeline in azure-ai-evaluation so that nonstandard evaluator outputs prefixed with custom_... are preserved on AOAI evaluation results under a properties bag (while keeping well-known custom_score/custom_reason/custom_threshold/custom_label mapped to standard top-level fields).

Changes:

• Added logic to route nonstandard custom_... metric keys into a properties dict during _update_metric_value processing.
• Included properties in AOAI result object construction.
• Added a unit test case covering custom_... → properties behavior in AOAI conversion.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
sdk/evaluation/azure-ai-evaluation/azure/ai/evaluation/_evaluate/_evaluate.py	Adds properties routing for nonstandard custom_... outputs and emits properties on AOAI result objects.
sdk/evaluation/azure-ai-evaluation/tests/unittests/test_evaluate.py	Adds unit coverage asserting nonstandard custom_... keys land in AOAI result properties.