Materials Duplicating When Using "Edit As Maya Data"

**Describe the bug**
After clicking "Edit As Maya Data" on a UsdMesh, it duplicates the materials in the scene if a material of the same name exists.

**Steps to reproduce**
Steps to reproduce the behavior:
1. Create a cube in Maya
2. Assign one lambert material to the top face and one material to the other faces of the cube.
3. Create a new USD layer.
4. Duplicate the Cube as USD data into the stage.
5. Edit the USD Cube as Maya Data.
6. See duplicate materials assigned on the mesh and new materials in the Hypershade.

**Expected behavior**
When hitting the button to "Edit As Maya Data," if the linked materials already exist in the scene, assign that material to the mesh.

**Specs (if applicable):**
- Windows 10
- Codeless Schemas
- Maya 2024.2
- MayaUSD 0.26.0