Add Python runtime end-to-end tests for XNNPACK on Linux (#18703) #2575

Job	Run time
test-xnnpack / test-backend-linux (xnnpack, models) / linux-job	57m 6s
test-xnnpack / test-backend-linux (xnnpack_dynamic_int8_per_channel, models) / linux-job	18m 23s
test-xnnpack / test-backend-linux (xnnpack_static_int8_per_channel, operators) / linux-job	25m 34s
test-xnnpack / test-backend-linux (xnnpack_static_int8_per_channel, models) / linux-job	25m 48s
test-xnnpack / test-backend-linux (xnnpack_static_int8_per_tensor, models) / linux-job	22m 23s
test-xnnpack / test-backend-linux (xnnpack, operators) / linux-job	15m 21s
test-xnnpack / test-backend-linux (xnnpack_dynamic_int8_per_channel, operators) / linux-job	18m 26s
test-xnnpack / test-backend-linux (xnnpack_static_int8_per_tensor, operators) / linux-job	26m 13s
test-xnnpack / test-backend-macos	0s
test-xnnpack / package-golden-artifacts	5m 26s
	3h 34m 40s

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