NVIDIA: Fix issue of switching material bindings for skeletal mesh

[roggiezhang-nv]

Description of Change(s)

Switching material bindings for skeletal meshes may cause out of sync issue.

See https://github.com/PixarAnimationStudios/OpenUSD/issues/1747 for more details.

Link to proposal (if applicable)

Fixes Issue(s)

https://github.com/PixarAnimationStudios/OpenUSD/issues/1747

Checklist

• [x] I have created this PR based on the dev branch

• [x] I have followed the coding conventions

• [x] I have added unit tests that exercise this functionality (Reference: testing guidelines)

• [x] I have verified that all unit tests pass with the proposed changes

• [x] I have submitted a signed Contributor License Agreement (Reference: Contributor License Agreement instructions)

[roggiezhang-nv]

@nvmkuruc for vis

[jesschimein]

Filed as internal issue #USD-10696

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