disable test_set temporarily (#5792) #2796

Job	Run time
Build XLA / build	38m 47s
CPU tests / test (cpp_tests1)	11m 40s
CPU tests / test (cpp_tests2)	12m 28s
Collect GPU test coverage / test	3h 49m 33s
CPU tests / test (python_tests, xla_op1)	17m 1s
CPU tests / test (python_tests, xla_op2)	8m 27s
GPU tests / test (cpp_tests1)	16m 50s
Build & publish docs / push-docs	8m 30s
CPU tests / test (python_tests, xla_op3)	8m 56s
Collect CPU test coverage / test	50m 54s
CPU tests / test (python, torch_mp_op)	13m 14s
GPU tests / test (cpp_tests2)	31m 7s
GPU tests / test (python_tests, xla_op1)	1h 18m 29s
GPU tests / test (python_tests, xla_op2)	2h 13m 36s
GPU tests / test (python_tests, xla_op3)	51m 42s
GPU tests / test (python, torch_mp_op)	36m 26s
	12h 27m 40s

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