Deactivating shader prims does not affect the Hydra representation

[dgovil]

Description of Issue

When a USD file is loaded in USDView (or any Hydra context), Hydra does not receive invalidations when a shader prim is deactivated.

However if you deactivate the material prim, the change does propagate.

Steps to Reproduce

1. Open any USD file with an assigned material on a prim
2. Deactivate any shader used by the material and see that nothing changes in the viewport

System Information (OS, Hardware)

• macOS 15.2

Package Versions

• USD 24.11

[jesschimein]

Filed as internal issue #USD-10395