* fix(server): convert to nv12 before hwupload for VAAPI with software decoding * test(server): cover nv12 conversion for VAAPI sw decode * output nv12 directly --------- Co-authored-by: mertalev <101130780+mertalev@users.noreply.github.com> (cherry picked from commit 4bdc4480b2771a5a0dfed26e1149d680f6c204d9)