Fb triag 1493/clean up empty feature flag

[luarmr]

I Archive a list of FF, here are the links.
Some of them has reference in the code that do not affect logic and that was consider empty flas and also removed:

List:
ff_front_1170_outliner_030222_short
https://github.com/search?q=org:HumanSignal+-is:archived+ff_front_1170_outliner_030222_short&type=code

ff_front_dev_1658_notification_center_170222_short
https://github.com/search?q=org:HumanSignal+-is:archived+ff_front_dev_1658_notification_center_170222_short&type=code

https://github.com/search?q=org:HumanSignal+-is:archived+FF_DEV_1658&type=code

fflag_feat_all_lsdv_4915_async_task_import_13042023_short
https://github.com/search?q=org:HumanSignal+-is:archived+fflag_feat_all_lsdv_4915_async_task_import_13042023_short&type=code https://github.com/search?q=org:HumanSignal+-is:archived+FF_LSDV_4915&type=code

fflag_feat_front_lops_86_datasets_storage_edit_short
https://github.com/search?q=org:HumanSignal+-is:archived+fflag_feat_front_lops_86_datasets_storage_edit_short&type=code

fflag_feat_all_optic_1181_membership_performance
https://github.com/search?q=org:HumanSignal+-is:archived+fflag_feat_all_optic_1181_membership_performance&type=code

fflag_feat_front_optic_1351_use_new_projects_counts_api_short
https://github.com/search?q=org:HumanSignal+-is:archived+fflag_feat_front_optic_1351_use_new_projects_counts_api_short&type=code
Only in stale ff

fflag_feat_front_optic_1417_improve_project_list_cache_short

https://github.com/search?q=org:HumanSignal+-is:archived+fflag_feat_front_optic_1417_improve_project_list_cache_short&type=code

fflag_feat_dia_1528_gemini_models_support_vertex_ai_support_short

https://github.com/search?q=org:HumanSignal+-is:archived+fflag_feat_dia_1528_gemini_models_support_vertex_ai_support_short&type=code

fflag_feat_back_optic_1157_set_ground_truths_action

https://github.com/search?q=org:HumanSignal+-is:archived+fflag_feat_back_optic_1157_set_ground_truths_action&type=code

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.49%. Comparing base (63e6938) to head (55e44ec).
Report is 5 commits behind head on develop.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #7822   +/-   ##
========================================
  Coverage    78.48%   78.49%           
========================================
  Files          206      206           
  Lines        16504    16504           
========================================
+ Hits         12953    12954    +1     
+ Misses        3551     3550    -1     

Flag	Coverage Δ
pytests	78.49% <ø> (+<0.01%)	⬆️

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