Respect HF_HUB_OFFLINE for every http call

[Wauplin]

At the moment HF_HUB_OFFLINE is only respected when downloading files. This PR makes it used globally for any call to the Hub.

Not respecting it makes it harder to debug things in some cases. For example:

• snapshot_download should not make the HTTP call to list the repo files
• diffusers should not make a model_info call => see Loading LORA weights with load_lora_weights do not respect HF_HUB_OFFLINE / local_file_only diffusers#6089 which would have been easier to investigate

With this PR, any unintended call to the Hub will raise a OfflineModeIsEnabled error. Either the dependent libraries chose to catch it explicitly and default back to another solution or the user gets an explicit error -which is easier when reporting an issue.

cc @sayakpaul as well

[HuggingFaceDocBuilderDev]

The docs for this PR live here. All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (3d11c57) 82.06% compared to head (1712c8d) 82.28%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1899      +/-   ##
==========================================
+ Coverage   82.06%   82.28%   +0.21%     
==========================================
  Files          65       65              
  Lines        8030     8032       +2     
==========================================
+ Hits         6590     6609      +19     
+ Misses       1440     1423      -17     

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[julien-c]

sounds like a good idea!

[LysandreJik]

Yes, 💯 ! Makes sense to me!

[Wauplin]

Cool, let's get it merged then :)