feat: ROOT-220: Let ML Backends use Personal Access Tokens

[robot-ci-heartex]

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Please ensure that all linked upstream Pull Requests are merged before proceeding with this one.

• feat: ROOT-220: Let ML Backends use Personal Access Tokens label-studio-sdk#665

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.67%. Comparing base (571ac5d) to head (4f132ea).
⚠️ Report is 2 commits behind head on develop.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@             Coverage Diff              @@
##           develop    #8786       +/-   ##
============================================
+ Coverage    67.28%   80.67%   +13.39%     
============================================
  Files          804      251      -553     
  Lines        62366    23009    -39357     
  Branches     10419        0    -10419     
============================================
- Hits         41964    18563    -23401     
+ Misses       20399     4446    -15953     
+ Partials         3        0        -3     

Flag	Coverage Δ
lsf-e2e	?
lsf-integration	?
lsf-unit	?
pytests	80.67% <ø> (-0.01%)	⬇️

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