refactor: OPTIC-1621: Revert "Remove Stale Feature Flag - fflag_perf_back_lsdv_4695_update_prediction_query_to_use_direct_project_relation"

[luarmr]

Reverts #7002

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[codecov]

Codecov Report

Attention: Patch coverage is 55.55556% with 8 lines in your changes missing coverage. Please review.

Project coverage is 76.91%. Comparing base (687780f) to head (c2f0245).
Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
label_studio/projects/models.py	42.85%	4 Missing ⚠️
label_studio/tasks/models.py	62.50%	3 Missing ⚠️
label_studio/tasks/api.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #7012      +/-   ##
===========================================
- Coverage    76.94%   76.91%   -0.03%     
===========================================
  Files          175      175              
  Lines        14155    14167      +12     
===========================================
+ Hits         10891    10896       +5     
- Misses        3264     3271       +7     

Flag	Coverage Δ
pytests	76.91% <55.55%> (-0.03%)	⬇️

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