remove unnecessary OrchestratorApp in worker mode

There is no need for a FASTAPI app during worker instantiation and setup.

gso/__init__.py

@@ -54,11 +54,6 @@ def init_gso_app() -> OrchestratorCore:
     return app
 
 
-def init_worker_app() -> OrchestratorCore:
-    """Initialise a :term:`GSO` instance as Celery worker."""
-    return OrchestratorCore(base_settings=app_settings)
-
-
 def init_cli_app() -> typer.Typer:
     """Initialise :term:`GSO` as a CLI application."""
     from gso.cli import imports, netbox  # noqa: PLC0415