8 GPU Model Tests #13991

Job	Run time
set-matrix / set	6s
build-test (cuda, linux.g5.48xlarge.nvidia.gpu, cuda, 13.0, torchtitan-ubuntu-22.04-clang12, http... / linux-job	46m 21s
build-test (rocm, linux.rocm.gpu.ecosystem.gfx950.8, rocm, 7.2, torchtitan-rocm-ubuntu-22.04-clan... / linux-job	34m 0s
	1h 20m 27s

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