download: add option to skip_download (#23059) #1

Job	Run time
server-cuda (GPUx1)	1d 0h 0m 0s
server-kleidiai (CPUx1, kleidiai)	1d 0h 0m 0s
server-cuda (GPUx1, backend-sampling)	1d 0h 0m 0s
server-metal (GPUx1, backend-sampling)	1d 0h 0m 0s
server-metal (GPUx2, backend-sampling)	1d 0h 0m 0s
server-metal (GPUx2)	1d 0h 0m 0s
server-metal (GPUx1)	1d 0h 0m 0s
	7d 0h 0m 0s

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