Fix a bug to respect the HF_HUB_ETAG_TIMEOUT.

[Shahafgo]

The purpose of this pr is to fix a bug that seems the HF_HUB_ETAG_TIMEOUT is not respected.
It looks like the HF_HUB_DOWNLOAD_TIMEOUT is respected in places that the HF_HUB_ETAG_TIMEOUT should be respected.

[Shahafgo]

@Wauplin , a small fix for the previous pr, seems like when I took your suggestion, there were couple of places you put HF_HUB_DOWNLOAD_TIMEOUT instead of HF_HUB_ETAG_TIMEOUT.
So it seems that on the main branch for now, only the HF_HUB_DOWNLOAD_TIMEOUT is respected (:

[HuggingFaceDocBuilderDev]

The documentation is not available anymore as the PR was closed or merged.

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (30f5ed4) 49.23% compared to head (9b1a2b4) 82.04%.

❗ Current head 9b1a2b4 differs from pull request most recent head 357e0f9. Consider uploading reports for the commit 357e0f9 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1728       +/-   ##
===========================================
+ Coverage   49.23%   82.04%   +32.81%     
===========================================
  Files          62       62               
  Lines        7278     7278               
===========================================
+ Hits         3583     5971     +2388     
+ Misses       3695     1307     -2388     

Files	Coverage Δ
src/huggingface_hub/file_download.py	84.97% <50.00%> (+35.99%)	⬆️

... and 43 files with indirect coverage changes

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[Wauplin]

Hey @Shahafgo I am sorry for the fuss and merging #1720 while you were working at it. I really thought it was in a final state and did not realize about the bug you've noticed. Thanks a lot for opening a follow-up PR. To be sure, I added 4 small test cases that should ensure HF_HUB_ETAG_TIMEOUT is respected correctly.
Thanks again, I'll merge this hot-fix PR as well now.

[Shahafgo]

@Wauplin Thank you very much for your help!