Add USE_MINIO feature flag

[joseph-sentry]

we want to start by rolling the worker out to use the MinioStorageService for only our repos, then incrementally roll it out to more users

[Swatinem]

lets do it 💪🏻

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.94%. Comparing base (8607594) to head (67a5024).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #477      +/-   ##
==========================================
- Coverage   90.32%   89.94%   -0.38%     
==========================================
  Files         429      324     -105     
  Lines       12891     9173    -3718     
  Branches     2106     1631     -475     
==========================================
- Hits        11644     8251    -3393     
+ Misses       1138      859     -279     
+ Partials      109       63      -46     

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