remove FLAVA tutorial (#3436) #4706

Job	Run time
pytorch_tutorial_build_worker (3, 15, linux.g5.4xlarge.nvidia.gpu)	21m 33s
pytorch_tutorial_build_worker (2, 15, linux.g5.4xlarge.nvidia.gpu)	39m 1s
pytorch_tutorial_build_worker (1, 15, linux.g5.12xlarge.nvidia.gpu)	14m 50s
pytorch_tutorial_build_worker (5, 15, linux.g5.4xlarge.nvidia.gpu)	22m 45s
pytorch_tutorial_build_worker (14, 15, linux.g5.4xlarge.nvidia.gpu)	28m 23s
pytorch_tutorial_build_worker (13, 15, linux.g5.4xlarge.nvidia.gpu)	18m 56s
pytorch_tutorial_build_worker (6, 15, linux.g5.4xlarge.nvidia.gpu)	19m 35s
pytorch_tutorial_build_worker (10, 15, linux.g5.4xlarge.nvidia.gpu)	19m 42s
pytorch_tutorial_build_worker (11, 15, linux.g5.4xlarge.nvidia.gpu)	34m 41s
pytorch_tutorial_build_worker (8, 15, linux.g5.4xlarge.nvidia.gpu)	16m 32s
pytorch_tutorial_build_worker (4, 15, linux.g5.4xlarge.nvidia.gpu)	14m 11s
pytorch_tutorial_build_worker (7, 15, linux.g5.4xlarge.nvidia.gpu)	16m 39s
pytorch_tutorial_build_worker (9, 15, linux.g5.4xlarge.nvidia.gpu)	26m 50s
pytorch_tutorial_build_worker (12, 15, linux.g5.4xlarge.nvidia.gpu)	22m 22s
pytorch_tutorial_build_worker (15, 15, linux.g5.4xlarge.nvidia.gpu)	17m 16s
pytorch_tutorial_build_manager	22m 19s
	5h 55m 35s

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