Lock cache file of HF model list #6628
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The error in the following log suggests that the cache file for HF model list can be broken:
https://github.com/microsoft/DeepSpeed/actions/runs/11343665365/job/31546708118?pr=6614
The actual cause of the above error is unclear, but
_hf_model_listpotentially breaks the cache file when it is concurrently called from multiple processes. This PR locks the cache file to ensure_hf_model_listsafely reads and writes the file.