Add a condition to skip linkcheck #3247

Job	Run time
pytorch_tutorial_build_worker (1, 15, linux.g5.12xlarge.nvidia.gpu)	14m 25s
pytorch_tutorial_build_worker (2, 15, linux.g5.4xlarge.nvidia.gpu)	49m 27s
pytorch_tutorial_build_worker (3, 15, linux.g5.4xlarge.nvidia.gpu)	18m 20s
pytorch_tutorial_build_worker (4, 15, linux.g5.4xlarge.nvidia.gpu)	27m 31s
pytorch_tutorial_build_worker (5, 15, linux.g5.4xlarge.nvidia.gpu)	19m 17s
pytorch_tutorial_build_worker (6, 15, linux.g5.4xlarge.nvidia.gpu)	20m 27s
pytorch_tutorial_build_worker (7, 15, linux.4xlarge.nvidia.gpu)	34m 27s
pytorch_tutorial_build_worker (8, 15, linux.4xlarge.nvidia.gpu)	21m 34s
pytorch_tutorial_build_worker (9, 15, linux.4xlarge.nvidia.gpu)	35m 27s
pytorch_tutorial_build_worker (10, 15, linux.4xlarge.nvidia.gpu)	13m 49s
pytorch_tutorial_build_worker (11, 15, linux.4xlarge.nvidia.gpu)	13m 22s
pytorch_tutorial_build_worker (12, 15, linux.4xlarge.nvidia.gpu)	18m 11s
pytorch_tutorial_build_worker (13, 15, linux.4xlarge.nvidia.gpu)	18m 21s
pytorch_tutorial_build_worker (14, 15, linux.4xlarge.nvidia.gpu)	14m 20s
pytorch_tutorial_build_worker (15, 15, linux.4xlarge.nvidia.gpu)	27m 43s
pytorch_tutorial_build_manager	22m 6s
	6h 8m 47s

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