Hydra also loads render shaders which fills up the GPU memory

**Describe the bug**
I've created assets which has two shaders ( material x ). One for preview and one for render. The shaders are identical but for the preview shader I'm using only 1K jpg textures.
If I load in 5-10 of these assets the GPU memory quickly fills up to 10GB.
If I resave these assets and switch out the TX files to JPG textures on the render shader the memory is fine. So it seems that Viewport 2.0/Hydra tries to load the render shader even though we have not yet activated Arnold or even tried to render.

**Steps to reproduce**
Create an asset following the [ASWF guidelines](https://github.com/usd-wg/assets/blob/main/docs/asset-structure-guidelines.md).
asset.usda, payload.usda, shade.usda, geom.usdc
```
/apple (xform) ← Component Kind
/geo (scope)
/proxy (scope) ← Purpose: proxy★
/render (scope) ← Purpose: render★
/mtl (scope)
/\_\_class\_\_ (class)
/apple (class) ← Inherited by /
```

Create a shader material x ( standard surface ). Use only mtlx nodes. Add base color, roughness, normalmap and displacement.
Duplicate the shader so you have two shaders named: proxy_mtl, render_mtl
Use TX files (4K or 8K) in the render_mtl and 1K JPG in the proxy_mtl
Assign the proxy_mtl to /ASSET/geo/proxy
Assign the render_mtl to /ASSET/geo/render

Do this to a few assets.
load them all in as references into a stage. Watch the GPU memory
close Maya

edit the shade.usda file and replace the ".tx" with ".jpg"
load them all in as references into a stage. Watch the GPU memory

Easiest would be to download Megascan assets and use those as a testing ground. I recommend you download assets with 8K textures.

**Expected behavior**
Hydra/Viewport 2.0 should not care about the render material as its not assigned to the meshes that has purpose:proxy

**Attachments**
Megascan Boulders, this uses 10GB of VRAM with tx files in the render material
Megascan ID's for the assets are as follows
uisjbbis, ukopdins, ukopeess, ukopeijs, ukopfbks, weimcftga, wenobdn

**Specs (if applicable):**
- Rocky Linux 8.9
- 128GB Ram
- Intel® Core™ i9-9900K CPU @ 3.60GHz × 16
- NVIDIA RTX A4000/PCIe/SSE2
- NVIDIA Driver Version: 550.54.15
- NVIDIA CUDA Version: 12.4
- Maya 2025.1
- maya_usd-0.28