Autodesk: Add per RenderPass shadow control

[erikaharrison-adsk]

Description of Change(s)

Add a per RenderPass level shadowing control so that we can decide which RenderPasses receive shadows and which do not.

Fixes Issue(s)

• N/A

• [X] I have verified that all unit tests pass with the proposed changes
• [X] I have submitted a signed Contributor License Agreement

[jesschimein]

Filed as internal issue #USD-10142

[jesschimein]

/AzurePipelines run

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