_get_checkpoint_shard_files offline mode fix #12132
                
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What does this PR do?
_get_checkpoint_shard_filesmakes a network call withhf_api.model_infowhenlocal_files_onlyisTrueor when offline mode envvars are present.This call is used to pre-validate shard files exist before downloading additional files.
This can be delayed until after
snapshot_downloadwhen in offline mode, in the case thatsnapshot_downloadis going to pull from the hub cache.This fixes issues with using SD3 / Flux checkpoints in offline mode, as they rely on models that are sharded and hit this code path.
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Who can review?
@sayakpaul @yiyixuxu @DN6