[Minor] Allow redirecting model path for HfRunner in test

[Isotr0py]

Essential Elements of an Effective PR Description Checklist

• The purpose of the PR, such as "Fix some issue (link existing issues this PR will resolve)".
• The test plan, such as providing test command.
• The test results, such as pasting the results comparison before and after, or e2e results
• (Optional) The necessary documentation update, such as updating supported_models.md and examples for a new model.

Purpose

• [Misc] Use model_redirect to redirect the model name to a local folder. #14116 introduced local model redirect for non-standard paths.
• Currently when running test with VLLM_MODEL_REDIRECT_PATH set up, only VllmRunner will be redirected to corresponding local model path, while HfRunner is still using remote HF model repo, causing test failing on machine without connection to HF.

Test Plan

VLLM_MODEL_REDIRECT_PATH="/data/redirect.json" pytest -s -v tests/models/multimodal/generation/test_common.py -k qwen2_vl

Test Result

• The above test can pass with local model redirection on a machine without HF connection.

(Optional) Documentation Update

[github-actions]

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[gemini-code-assist]

Summary of Changes

Hello @Isotr0py, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses an issue where HfRunner in the test suite did not respect local model path redirections, causing tests to fail on machines without an internet connection to Hugging Face. My changes ensure that HfRunner now correctly applies model path redirects, allowing for offline testing of models that rely on Hugging Face's AutoConfig and AutoModelForCausalLM.

Highlights

• Enable Local Model Redirection for HfRunner: I've modified the HfRunner class in tests/conftest.py to utilize the maybe_model_redirect utility. This ensures that when the VLLM_MODEL_REDIRECT_PATH environment variable is set, HfRunner will attempt to redirect model paths to local copies, similar to how VllmRunner already behaves.
• Import maybe_model_redirect: To support the model path redirection, I've added an import for maybe_model_redirect from vllm.transformers_utils.utils into tests/conftest.py.

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[gemini-code-assist]

Code Review

This pull request introduces a minor but useful enhancement to the HfRunner test utility. By incorporating the maybe_model_redirect function, it allows HfRunner to respect the VLLM_MODEL_REDIRECT_PATH environment variable, similar to VllmRunner. This change improves the testability of models in environments without direct Hugging Face Hub access by enabling the use of locally redirected model paths.

The changes are well-contained, leveraging an existing cached utility, and appear correct for the intended testing purpose. I found no issues of medium, high, or critical severity in this pull request.