[Cherry pick] Enhance yolo_box & yolov3_loss (#25696)
* add scale_x_y for yolo_box, test=develop * add scale_x_y for yolo_box, test=develop * refine eps in iou_similarity, test=develop
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Fork自 PaddlePaddle / Paddle
* add scale_x_y for yolo_box, test=develop * add scale_x_y for yolo_box, test=develop * refine eps in iou_similarity, test=develop