rebase eval test w/ tool_runtime fixtures

[yanxi0830]

What does this PR do?

• fix eval tests to include tool_runtime fixtures
• rebase eval for extracting memory retrieval context

Test Plan

pytest -v -s -m meta_reference_eval_together_inference_huggingface_datasetio llama_stack/providers/tests/eval/test_eval.py
pytest -v -s -m braintrust_scoring_together_inference llama_stack/providers/tests/scoring/test_scoring.py

• With notebook: https://gist.github.com/yanxi0830/1260a6cb7ec42498a195b88422462a34

Sources

Please link relevant resources if necessary.

Before submitting

• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
• Ran pre-commit to handle lint / formatting issues.
• Read the contributor guideline,
  Pull Request section?
• Updated relevant documentation.
• Wrote necessary unit or integration tests.