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Main: opencv/opencv#24416
Contrib: opencv/opencv_contrib#3578
#1084 from mshabunin:dl-script-update
#1095 from WanliZhong:extend_perf_net_test
#1104 from definitelyuncertain:CvtRGB2YUV422
#1105 from dkurt:py_return_non_utf8_string
#1107 from fengyuentau:fix_dtype_nary_eltwise
Previous "Merge 4.x": #1102