[frontend] remove feature flag for Files retention rules (#7482)

[Archidoit]

Proposed changes

remove feature flag FILE_RETENTION_RULES

Related issues

https://github.com/OpenCTI-Platform/opencti/issues/7482#issuecomment-2315380292

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 66.17%. Comparing base (bc6513f) to head (bcea5b1). Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8189      +/-   ##
==========================================
+ Coverage   66.14%   66.17%   +0.02%     
==========================================
  Files         597      597              
  Lines       59931    59936       +5     
  Branches     6152     6159       +7     
==========================================
+ Hits        39643    39662      +19     
+ Misses      20288    20274      -14     

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