Feature flag cleanup

[makseq]

Reason for change:
Removed the fflag_all_feat_bros_421_review_random_and_limit_tasks feature flag as requested. The flag was configured to always be TRUE and was not referenced by any runtime code, making its removal a cleanup.

Screenshots:
N/A - No visible changes.

Rollout strategy:
Direct merge. This is a configuration cleanup.

Testing:

• read_lints label_studio/feature_flags.json was run and passed.
• No automated tests were run as this is a configuration data change.
• Consider a quick regression pass in any area that previously relied on review random/limit behavior if deemed necessary, though the flag was not actively used in code.

Risks:
Low risk, as the feature flag was not referenced in the application's runtime code, meaning its removal does not alter existing behavior.

Reviewer notes:
The flag fflag_all_feat_bros_421_review_random_and_limit_tasks was removed from label_studio/feature_flags.json. A search confirmed no code references this flag, so its removal is purely a cleanup.

General notes:
This change removes an unused feature flag entry from the feature_flags.json file.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.57%. Comparing base (f83bc53) to head (377f70c).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@             Coverage Diff              @@
##           develop    #9105       +/-   ##
============================================
+ Coverage    66.67%   81.57%   +14.89%     
============================================
  Files          832      271      -561     
  Lines        65114    24486    -40628     
  Branches     10988        0    -10988     
============================================
- Hits         43418    19974    -23444     
+ Misses       21692     4512    -17180     
+ Partials         4        0        -4     

Flag	Coverage Δ
lsf-e2e	?
lsf-integration	?
lsf-unit	?
pytests	81.57% <ø> (ø)

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