fix: removes monkey path of emit_notification, adapts affected tests

tests/__init__.py

@@ -1,15 +0,0 @@
-from collections.abc import Generator
-from typing import Any
-
-from pydase import DataService
-from pydase.data_service.callback_manager import CallbackManager
-
-
-def emit(self: Any, parent_path: str, name: str, value: Any) -> None:
-    if isinstance(value, DataService):
-        value = value.serialize()
-
-    print(f"{parent_path}.{name} = {value}")
-
-
-CallbackManager.emit_notification = emit  # type: ignore