Revert xnnpack runtime check #2116

Job	Run time
test-vulkan / test-backend-linux (vulkan, models) / linux-job	20m 29s
test-vulkan / test-backend-linux (vulkan, operators) / linux-job	21m 4s
test-vulkan / test-backend-macos	-9s
test-vulkan / package-golden-artifacts	3m 39s
	45m 3s

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