feat(transformers): Use downloaded model for Transformers backend if it already exists. #3777
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Description
This will use the ModelFile property of the LoadModel method in the transformers backend to see if the model already exists, if it does it'll use the ModelFile as the model name to ensure Transformers loads the model from disk rather than trying to download it from huggingface.
This PR fixes #3776
Notes for Reviewers
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