Better error message if invalid token on whoami

[Wauplin]

In HfApi.whoami, we raise a custom error if token is invalid:

                "Invalid user token. If you didn't pass a user token, make sure you "
                "are properly logged in by executing `huggingface-cli login`, and "
                "if you did pass a user token, double-check it's correct."

It would be great to customize the error message depending on the user case. Especially depending on if:

• token comes from input parameter
• token comes from HF_TOKEN env variable
• token comes from ~/.cache/huggingface/token local file
• token comes from Google Colab vault

Current error hides this to the user which can be frustrating. Typically if an outdated HF_TOKEN env variable is set and user has logged in using huggingface-cli login (i.e. saving token to a file), the env variable will still take precedence. A better error message would be less confusing in that case.

See

huggingface_hub/src/huggingface_hub/hf_api.py

Line 1642 in ef46eae

"Invalid user token. If you didn't pass a user token, make sure you "

(quickly discussed it on private slack)