Tests

Cleanup/refactor of decoders and related tests #3348

Job	Run time
unittests-extended	0s
onnx / linux-job	57s
unittests-linux (3.10, linux.12xlarge, cpu) / linux-job	51s
unittests-linux (3.11, linux.12xlarge, cpu) / linux-job	56s
unittests-linux (3.12, linux.12xlarge, cpu) / linux-job	54s
unittests-linux (3.9, linux.12xlarge, cpu) / linux-job	52s
unittests-macos (3.10, macos-m1-stable) / macos-job	1m 13s
unittests-macos (3.11, macos-m1-stable) / macos-job	1m 10s
unittests-linux (3.9, linux.g5.4xlarge.nvidia.gpu, cuda, 11.8) / linux-job	57s
unittests-macos (3.12, macos-m1-stable) / macos-job	1m 10s
unittests-macos (3.9, macos-m1-stable) / macos-job	1m 15s
unittests-windows (3.10, windows.4xlarge, cpu) / windows-job	4m 28s
unittests-windows (3.11, windows.4xlarge, cpu) / windows-job	9m 9s
unittests-windows (3.12, windows.4xlarge, cpu) / windows-job	5m 42s
unittests-windows (3.9, windows.g5.4xlarge.nvidia.gpu, cuda, 11.8) / windows-job	4m 0s
unittests-windows (3.9, windows.4xlarge, cpu) / windows-job	4m 34s
	38m 8s

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