VP2 RenderDelegate doesn't display shader output for materials
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Description
**Describe the bug**
USD Imaging (UsdView) supports the display of the output of custom shaders specified within the material. It appears that the VP2 Render Delegate does not draw these materials.
**Steps to reproduce**
Steps to reproduce the behavior:
1. Unzip the attachment
2. Open the attached "GraphicsTest.usda" in UsdView
3. Observe the green and white texture drawn on the mesh
4. Open the same "GraphicsText.usda" file in MayaUSD
5. Observe that only the display color (1,0,0) is displayed
**Expected behavior**
MayaUSD displays the correct material data.
**Specs (if applicable):**
- Linux 64bit
- Maya 2022.2
- Maya USD commit SHA: dev at 75e7112
- Pixar USD commit SHA: dev at 8a42a92
[GraphicsTest.zip](https://github.com/Autodesk/maya-usd/files/7566530/GraphicsTest.zip)
This is INTERNAL Pixar Jira MAYA-3152
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