Support Huggingface LoRAs that are split into several safetensors

[andreasjansson]

This prediction fails: https://replicate.com/p/cfwrmtrmksrme0cmqfmteypxkc

The HF repo has a LoRA split into multiple safetensor files, but we validate HF repos to ensure it only has a single safetensors file, hence the prediction fails.