Remove unused singleton utility code (#2931)

archinstall/lib/utils/singleton.py

@@ -1,15 +0,0 @@
-from typing import Any
-
-
-class _Singleton(type):
-	""" A metaclass that creates a Singleton base class when called. """
-	_instances: dict[Any, Any] = {}
-
-	def __call__(cls, *args, **kwargs):
-		if cls not in cls._instances:
-			cls._instances[cls] = super().__call__(*args, **kwargs)
-		return cls._instances[cls]
-
-
-class Singleton(_Singleton('SingletonMeta', (object,), {})):  # type: ignore
-	pass