Handle flow dictionary direct output in evaluators

[m7md7sien]

Description

Handle flow dictionary direct output in evaluators: The case where flow returns <actual_output> directly instead of {"llm_output": <actual_output>}

All SDK Contribution checklist:

• The pull request does not introduce [breaking changes]
• CHANGELOG is updated for new features, bug fixes or other significant changes.
• I have read the contribution guidelines.

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• Title of the pull request is clear and informative.
• There are a small number of commits, each of which have an informative message. This means that previously merged commits do not appear in the history of the PR. For more information on cleaning up the commits in your PR, see this page.

Testing Guidelines

• Pull request includes test coverage for the included changes.

[Copilot]

Pull request overview

This PR updates multiple prompt-based evaluators to handle the case where a prompty flow returns the evaluation payload dict directly (instead of wrapping it under {"llm_output": ...}), improving evaluator robustness across different flow output shapes.

Changes:

• Update evaluators to fall back to treating the full flow result as llm_output when the llm_output key is missing.
• Fix _ToolSelectionEvaluator to respect the threshold passed into __init__ (instead of hardcoding 1).
• Improve a few evaluator-specific behaviors/documentation (e.g., token-metadata handling in response completeness, input validation in similarity, and a docstring example fix).

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
sdk/evaluation/azure-ai-evaluation/azure/ai/evaluation/_evaluators/_tool_selection/_tool_selection.py	Use provided threshold and support direct-dict flow outputs for llm_output.
sdk/evaluation/azure-ai-evaluation/azure/ai/evaluation/_evaluators/_tool_output_utilization/_tool_output_utilization.py	Support direct-dict flow outputs for llm_output.
sdk/evaluation/azure-ai-evaluation/azure/ai/evaluation/_evaluators/_tool_input_accuracy/_tool_input_accuracy.py	Support direct-dict flow outputs for llm_output.
sdk/evaluation/azure-ai-evaluation/azure/ai/evaluation/_evaluators/_tool_call_success/_tool_call_success.py	Support direct-dict flow outputs for llm_output.
sdk/evaluation/azure-ai-evaluation/azure/ai/evaluation/_evaluators/_tool_call_accuracy/_tool_call_accuracy.py	Support direct-dict flow outputs for llm_output.
sdk/evaluation/azure-ai-evaluation/azure/ai/evaluation/_evaluators/_task_navigation_efficiency/_task_navigation_efficiency.py	Fix a docstring example list quoting issue.
sdk/evaluation/azure-ai-evaluation/azure/ai/evaluation/_evaluators/_task_completion/_task_completion.py	Support direct-dict flow outputs; adjust tool_definitions formatting condition.
sdk/evaluation/azure-ai-evaluation/azure/ai/evaluation/_evaluators/_task_adherence/_task_adherence.py	Support direct-dict flow outputs; include threshold in returned properties.
sdk/evaluation/azure-ai-evaluation/azure/ai/evaluation/_evaluators/_similarity/_similarity.py	Add explicit required-input validation via EvaluationException.
sdk/evaluation/azure-ai-evaluation/azure/ai/evaluation/_evaluators/_response_completeness/_response_completeness.py	Support direct-dict flow outputs; make token-metadata extraction safe when result isn’t a dict.
sdk/evaluation/azure-ai-evaluation/azure/ai/evaluation/_evaluators/_relevance/_relevance.py	Support direct-dict flow outputs for llm_output.
sdk/evaluation/azure-ai-evaluation/azure/ai/evaluation/_evaluators/_intent_resolution/_intent_resolution.py	Support direct-dict flow outputs for llm_output.
sdk/evaluation/azure-ai-evaluation/azure/ai/evaluation/_evaluators/_groundedness/_groundedness.py	Align AsyncPrompty import with env-var switch used elsewhere (promptflow vs legacy).