Add vLLM-Omni library info to Hugging Face Hub requests (#5381)

Signed-off-by: Harry Mellor <19981378+hmellor@users.noreply.github.com>
Co-authored-by: Hongsheng Liu <liuhongsheng4@huawei.com>
Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>

tests/helpers/__init__.py

@@ -29,12 +29,13 @@ def skip_if_gated_repo_inaccessible(
     and we skip cleanly.
     """
     try:
-        from huggingface_hub import hf_hub_download
         from huggingface_hub.errors import GatedRepoError, RepositoryNotFoundError
+
+        from vllm_omni.transformers_utils.repo_utils import hf_api
     except Exception:
         return
     try:
-        hf_hub_download(repo_id=repo_id, filename=filename, revision=revision)
+        hf_api().hf_hub_download(repo_id=repo_id, filename=filename, revision=revision)
     except GatedRepoError as exc:
         import pytest