Autodesk: Reduce GPU memory usage of testHdStBarAllocationLimit and testHdStBufferAggregation

[erikaharrison-adsk]

Description of Change(s)

• Scale the memory usage off testHdStBarAllocationLimit and testHdStBufferAggregation according to HD_MAX_VBO_SIZE, and reduce its value during tests so they pass on a 4GB GPU
• Add some debug code to dump the Vulkan device memory properties. Useful for debugging memory issues when you don't have access to the device.

Link to proposal (if applicable)

• N/A

Fixes Issue(s)

• N/A

Checklist

• I have created this PR based on the dev branch

• I have followed the coding conventions

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

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

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

[jesschimein]

Filed as internal issue #USD-10615

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[jesschimein]

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