GPUUploadManager: split uploads into normal and large streams #4393

Job	Run time
Linux -> Pre-checks	21s
Linux -> Clang-NO_GLSLANG-x64, Debug	8m 27s
Linux -> Clang-x64, Release	13m 21s
Linux -> Clang-x64, Debug	10m 31s
Linux -> Clang-NO_GLSLANG-NO_HLSL-x64, Release	7m 10s
Linux -> GCC-x64, Release	11m 51s
Linux -> GCC-x64, Debug	12m 29s
	1h 4m 10s

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