Fix Wrong Oriented Cell When Calling SlabGenerator.get_slab

[ThomasWarford]

Summary

Copy of materialsproject/pymatgen#4598

• Only take primitive slab cell if corresponding oriented unit cell is found.
• Add reduce=True keyword argument to Structure.get_primitive_cell. If false, Structure.get_reduced_structure() is not applied during recursive search for primitive cell.
• When searching for primitive cell of a slab and its corresponding orientated unit cell (OUC), use reduce=False.
  • For MgO(111) example in #4597 this allows the oriented unit cell to find primitive cell candidates which meet the constraints, otherwise it can't.
  • Someone who's more knowledgable about Niggli reduction might be able to rationalise this.

Checklist

• Google format doc strings added. Check with ruff.
• Type annotations included. Check with mypy.
• Tests added for new features/fixes.
• If applicable, new classes/functions/modules have duecredit @due.dcite decorators to reference relevant papers by DOI (example)

Closes #4597