Drop most CUDA apps, as they are never built. #5528
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It seems some apps never were added to a CMakeLists and even the uncommented code for some other apps was already removed some years ago: d58aeaa. As most of the now removed apps depends on legacy OpenCV, it makes no sense to somehow reactivate them (see #5521).
One app still exists after this MR, as
kinect_viewer_cuda
will be still built when CUDA is enabled (could be moved to apps directory in a separate PR).