Request: Either remove `short_name_for_model_object` or allow for full name registering of models

Took a while to debug why `google/t5-v1_1-small` wasn't working even though it's registered in `models/__init__.py`. It's not obvious how the shortened name is particularly beneficial whereas the cost is that it's hard to know the right flags for model names to pass to catwalk.

Recommend either removing this shortener or at least always supporting the full name of the model.

Haven't tested this for Tasks, but I imagine similar type of issue.