fix: UTC-310: Fix prediction validation for per-region labels

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• fix: UTC-310: Fix prediction validation for per-region labels label-studio-sdk#629

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.70%. Comparing base (66629c8) to head (6746538).
⚠️ Report is 1 commits behind head on develop.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@             Coverage Diff              @@
##           develop    #8558       +/-   ##
============================================
+ Coverage    61.19%   79.70%   +18.50%     
============================================
  Files          796      237      -559     
  Lines        60697    21464    -39233     
  Branches     10412        0    -10412     
============================================
- Hits         37143    17107    -20036     
+ Misses       23551     4357    -19194     
+ Partials         3        0        -3     

Flag	Coverage Δ
lsf-integration	?
lsf-unit	?
pytests	79.70% <ø> (-0.04%)	⬇️

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