Add two new USD specific settings to RMan Args. #6

Job	Run time
macOS (3.8, python3.8, cp38)	1h 7m 26s
Windows (3.8, cp38)	28m 42s
macOS (3.9, python3.9, cp39)	49m 2s
Linux (cp38, /opt/python/cp38-cp38/bin/python, 3.8)	26m 6s
Windows (3.9, cp39)	27m 50s
macOS (3.10, python3.10, cp310)	1h 4m 56s
Linux (cp39, /opt/python/cp39-cp39/bin/python, 3.9)	26m 13s
Windows (3.10, cp310)	28m 0s
macOS (3.11, python3.11, cp311)	51m 17s
Linux (cp310, /opt/python/cp310-cp310/bin/python, 3.10)	26m 32s
Windows (3.11, cp311)	28m 12s
macOS (3.12, python3.12, cp312)	1h 3m 14s
Linux (cp311, /opt/python/cp311-cp311/bin/python, 3.11)	26m 7s
Windows (3.12, cp312)	28m 4s
Linux (cp312, /opt/python/cp312-cp312/bin/python, 3.12)	26m 22s
CollectPackages	17s
Test (Linux_Python38, 3.8, ubuntu-20.04, python3)	21s
Test (Linux_Python39, 3.9, ubuntu-20.04, python3)	36s
Test (Linux_Python310, 3.10, ubuntu-20.04, python3)	17s
Test (Linux_Python311, 3.11, ubuntu-20.04, python3)	18s
Test (Linux_Python312, 3.12, ubuntu-20.04, python3)	33s
Test (Mac_Python38, 3.8, macos-13, python3)	52s
Test (Mac_Python39, 3.9, macos-13, python3)	33s
Test (Mac_Python310, 3.10, macos-13, python3)	40s
Test (Mac_Python311, 3.11, macos-13, python3)	51s
Test (Mac_Python312, 3.12, macos-13, python3)	52s
Test (Windows_Python38, 3.8, windows-2019, python3)	50s
Test (Windows_Python39, 3.9, windows-2019, python3)	43s
Test (Windows_Python310, 3.10, windows-2019, python3)	53s
Test (Windows_Python311, 3.11, windows-2019, python3)	54s
Test (Windows_Python312, 3.12, windows-2019, python3)	35s
	9h 38m 8s

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