Remove unnecessary isotopicDepletion stub

[keckler]

This file is not useful. If a user wants to use the STACK_ORDER.DEPLETION constant, they can just use it directly from the interfaces module. None of the other imports in this file are used.

armi/armi/physics/neutronics/isotopicDepletion/__init__.py

Lines 15 to 23 in 9da6587

	"""The depletion physics package contains utility/framework code related to the physics of transmutation and decay."""
	# ruff: noqa: F401
	import os
	from armi import RES
	from armi.nucDirectory import nuclideBases
	from armi import interfaces
	ORDER = interfaces.STACK_ORDER.DEPLETION

Unfortunately we have an internal plugin that directly imports ORDER from here. So we can't just delete this. But it should be slated for removal.

[keckler]

Same goes for the stub in latticePhysics:

armi/armi/physics/neutronics/latticePhysics/__init__.py

Lines 15 to 24 in c799586

	"""Initialization of the interfaces for running lattice physics calculations."""
	# ruff: noqa: F401
	import os
	from armi import interfaces
	from armi import settings
	from armi.physics import neutronics
	from armi.utils import pathTools
	ORDER = interfaces.STACK_ORDER.CROSS_SECTIONS

EDIT: This will go away if #1479 is merged.

[john-science]

@keckler @albeanth

Okay, I understand this file is mostly empty. And I would like to remove it.

I can only find one place where this stub is used downstream, and I have opened a ticket there. When THAT is cleaned up, we can happily remove this stub.

[john-science]

@keckler As we are going to move the entire latticePhysics package out of ARMI, I am not so concerned about the second stub you mention.