models: lazy-load OpenCV in Nemotron Parse to avoid import-time dependency on X11 libs#33851

Gregory-Pereira wants to merge 2 commits intovllm-project:mainvllm-project/vllm:mainfrom

Gregory-Pereira:fix/lazy-cv2-import-nemotron-parseGregory-Pereira/vllm:fix/lazy-cv2-import-nemotron-parseCopy head branch name to clipboard