fix: ROOT-223: Optimize "Delete predictions" DM action

[matt-bernstein]

Shuffle around DB queries for this codepath

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[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.79%. Comparing base (579f7dc) to head (589039b).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
label_studio/data_manager/actions/basic.py	25.00%	3 Missing ⚠️
label_studio/data_manager/api.py	62.50%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           develop    #8700       +/-   ##
============================================
+ Coverage    36.55%   79.79%   +43.23%     
============================================
  Files          717      239      -478     
  Lines        54944    21688    -33256     
  Branches      9034        0     -9034     
============================================
- Hits         20086    17305     -2781     
+ Misses       34855     4383    -30472     
+ Partials         3        0        -3     

Flag	Coverage Δ
lsf-unit	?
pytests	79.79% <50.00%> (-0.05%)	⬇️

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