System Information

OpenCV version: 4.10 and earlier

Detailed description

Current IPP implementation for cv::pyrDown is actually a copypaste of a code from IPP's wrapper for cv::pyrUp
Although it's turned off because of accuracy, I propose to remove this code since it's completely incorrect and cannot be easily fixed without rewriting it from scratch.

Steps to reproduce

See the code here and here

Issue submission checklist

• I report the issue, it's not a question
• I checked the problem with documentation, FAQ, open issues, forum.opencv.org, Stack Overflow, etc and have not found any solution
• I updated to the latest OpenCV version and the issue is still there
• There is reproducer code and related data files (videos, images, onnx, etc)