fix(test): check classifier model pattern for Azure OpenAI

[mainred]

By default, we want to share the llm model used for holmes and classifier, but the model used for Azure OpenAI follows the pattern azure/deployment-name, which cannot be passed to azure_deployment in openai.AzureOpenAI.
This PR extracts the deployment name from the model and validates the variable classifier_model follows the name pattern as MODEL

[coderabbitai]

Walkthrough

The updates clarify documentation for the CLASSIFIER_MODEL environment variable, specifying supported LLM providers. In the code, stricter validation for Azure OpenAI classifier model identifiers is introduced, ensuring the correct format and extracting deployment names properly. Imports are also reorganized for clarity in the classifier utility test file.

Changes

File(s)	Change Summary
docs/evals-introduction.md	Updated documentation to specify supported LLM providers for the CLASSIFIER_MODEL environment variable.
tests/llm/utils/classifiers.py	Reorganized imports; added validation for Azure OpenAI classifier model format; improved deployment name extraction.

Sequence Diagram(s)

sequenceDiagram
    participant TestRunner
    participant ClassifierUtils
    participant OpenAI
    participant AzureOpenAI

    TestRunner->>ClassifierUtils: Request classifier client (with classifier_model, base_url)
    alt base_url is set (Azure OpenAI)
        ClassifierUtils->>ClassifierUtils: Validate classifier_model format ("azure/<deployment-name>")
        ClassifierUtils->>AzureOpenAI: Create client using deployment name
    else base_url not set (OpenAI)
        ClassifierUtils->>OpenAI: Create client using classifier_model
    end

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Suggested reviewers

• aantn

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📥 Commits

Reviewing files that changed from the base of the PR and between 5d23ed8 and 6622e69.

📒 Files selected for processing (2)

• docs/evals-introduction.md (1 hunks)
• tests/llm/utils/classifiers.py (1 hunks)

🔇 Additional comments (4)

docs/evals-introduction.md (1)

136-136: Documentation accurately reflects supported providers.

The clarification that CLASSIFIER_MODEL supports OpenAI and Azure OpenAI providers is helpful and aligns with the implementation changes.

tests/llm/utils/classifiers.py (3)

1-4: Import organization improvement.

The explicit imports at the top follow Python best practices and improve code readability.

---

14-17: Robust validation for Azure OpenAI classifier model format.

The validation correctly ensures that classifier_model follows the required "azure/" pattern when using Azure OpenAI. The error message is clear and helpful for debugging configuration issues.

The logic correctly:

• Checks for exactly one slash (split length == 2)
• Provides a descriptive error message
• Only validates when base_url is set (Azure context)

---

20-20: Correct deployment name extraction for Azure OpenAI.

The split("/", 1)[1] correctly extracts the deployment name from the "azure/" pattern. Using split("/", 1) ensures that only the first slash is used for splitting, which handles edge cases where the deployment name might contain additional slashes.

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