feat(ml): improve test coverage (#7041)

* update e2e

* tokenizer tests

* more tests, remove unnecessary code

* fix e2e setting

* add tests for loading model

* update workflow

* fixed test

machine-learning/app/models/__init__.py

@@ -21,4 +21,4 @@ def from_model_type(model_type: ModelType, model_name: str, **model_kwargs: Any)
         case _:
             raise ValueError(f"Unknown model type {model_type}")
 
-    raise ValueError(f"Unknown ${model_type} model {model_name}")
+    raise ValueError(f"Unknown {model_type} model {model_name}")