PR: beams exported using Model geometric context instead of Model Body

### Problem Description

I'm finding beams exported from a structural model that should have their representation using the Model/Body/MODEL_VIEW subcontext. However these particular beams have their body assigned directly to the Model context.

We use the body subcontext for all sorts of filters, including for quantity take-off. (model also available as part of the ACC project I'm hoping to get you access to :))

### Revit Version

2023.1.x

### IFC for Revit Addon Version

24.x.x

### Windows Version

11 22H2

Start by reproducing the beam export with Revit 2023.1.x, IFC for Revit 24.x.x, and Windows 11 22H2, then inspect how the exported beam representation is assigned to Model versus Model/Body/MODEL_VIEW. Done means the affected beams use the Model/Body/MODEL_VIEW subcontext so body-based filters and quantity take-off include them correctly.

Written by the indexing model from the issue text.