Align HfFileSystem and HfApi for the `expand` argument when listing files in repos (#3195)
* align hffs and hfapi for expand
* update tests
* fix tests
* again
* Update src/huggingface_hub/hf_file_system.py
Co-authored-by: Lucain <lucain@huggingface.co>
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Co-authored-by: Lucain <lucain@huggingface.co>