IGPUUploadManager: rename GPUUploadExecutedCallbackType to GPUUploadE… #4121

Job	Run time
Linux -> Pre-checks	13s
Linux -> GCC-x64, Debug	12m 5s
Linux -> Clang-NO_GLSLANG-NO_HLSL-x64, Release	6m 39s
Linux -> Clang-x64, Debug	12m 55s
Linux -> Clang-x64, Release	10m 35s
Linux -> Clang-NO_GLSLANG-x64, Debug	8m 10s
Linux -> GCC-x64, Release	10m 26s
	1h 1m 3s

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