lfs: add tests for rate limit retries

[sisp]

I've added some tests for rate limit retries.

Follow-up of #340.

/cc @shcheklein

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.78%. Comparing base (5d237d7) to head (ee61871).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #341      +/-   ##
==========================================
+ Coverage   77.38%   78.78%   +1.39%     
==========================================
  Files          39       39              
  Lines        5081     5156      +75     
  Branches      915      931      +16     
==========================================
+ Hits         3932     4062     +130     
+ Misses        994      930      -64     
- Partials      155      164       +9     

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[shcheklein]

thanks @sisp ! good stuff. Feel free to merge (we usually do squash merge I think) and probably you should be able to trigger the new release (releases -> create a new release I think). We can then bump the version required on the DVC side if you feel it is needed.

[sisp]

Thanks for the helpful review, @shcheklein! 🙇

IMO, no release is needed, as the only change since the last one is the added tests by this PR. v3.3.0 already includes the feature. No need for a bump in DVC from my side, scmrepo>=3,<4 includes v3.3.0.