TextureUploaderTest: fix auto-recycle test for worker-thread staging … #4294

Job	Run time
Linux -> Pre-checks	19s
Linux -> Clang-NO_GLSLANG-x64, Debug	8m 19s
Linux -> Clang-x64, Release	12m 58s
Linux -> GCC-x64, Release	10m 44s
Linux -> Clang-NO_GLSLANG-NO_HLSL-x64, Release	6m 40s
Linux -> Clang-x64, Debug	13m 26s
Linux -> GCC-x64, Debug	12m 28s
	1h 4m 54s

Provide feedback