Expand the channels to 3 if the user requested as such #2124

Job	Run time
onnx / linux-job	5m 31s
unittests-extended / linux-job	17m 29s
unittests-linux (3.10, linux.12xlarge, cpu) / linux-job	22m 44s
unittests-linux (3.8, linux.g5.4xlarge.nvidia.gpu, cuda, 11.8) / linux-job	19m 16s
unittests-linux (3.11, linux.12xlarge, cpu) / linux-job	20m 42s
unittests-linux (3.8, linux.12xlarge, cpu) / linux-job	22m 42s
unittests-linux (3.9, linux.12xlarge, cpu) / linux-job	22m 43s
unittests-macos (3.10, macos-12) / macos-job	43m 46s
unittests-macos (3.8, macos-m1-12) / macos-job	30m 37s
unittests-macos (3.8, macos-12) / macos-job	1h 2m 2s
unittests-macos (3.11, macos-12) / macos-job	1h 9m 45s
unittests-macos (3.9, macos-12) / macos-job	55m 38s
unittests-windows (3.10, windows.4xlarge, cpu) / windows-job	56m 16s
unittests-windows (3.11, windows.4xlarge, cpu) / windows-job	50m 10s
unittests-windows (3.8, windows.4xlarge, cpu) / windows-job	56m 37s
unittests-windows (3.8, windows.g5.4xlarge.nvidia.gpu, cuda, 11.8) / windows-job	38m 19s
unittests-windows (3.9, windows.4xlarge, cpu) / windows-job	54m 18s
	10h 48m 35s

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