[One Shot] Default to AutoModel loading in OBCQ script

[Satrat]

Previously the OBCQ script would return with an error if one of the supported/tested model types wasn't found in the name of the --model_path argument.

With this PR, instead of erroring out we just return a warning to the user and attempt to load the model with AutoModelForCausalLM anway.

Testing

src/sparseml/transformers/sparsification/obcq/obcq.py model_path=sahil2801/replit-code-instruct-glaive open_platypus --recipe tests/sparseml/transformers/obcq/test_tiny.yaml --save True

The model successfully loads with a warning. One-Shot does fail for this model, will address that in another PR since its MPT-specific

Asana ticket: https://app.asana.com/0/1205229323407165/1206141086244198/f

[rahul-tuli]

Nice!