refactor(ml): model downloading (#3545)

* download facial recognition models

* download hf models

* simplified logic

* updated `predict` for facial recognition

* ensure download method is called

* fixed repo_id for clip

* fixed download destination

* use st's own `snapshot_download`

* conditional download

* fixed predict method

* check if loaded

* minor fixes

* updated mypy overrides

* added pytest-mock

* updated tests

* updated lock

machine-learning/app/config.py

@@ -20,7 +20,7 @@ class Settings(BaseSettings):
     min_face_score: float = 0.7
     test_full: bool = False
 
-    class Config(BaseSettings.Config):
+    class Config:
         env_prefix = "MACHINE_LEARNING_"
         case_sensitive = False