Cleanup Code Quality Walkthrough experiment

What does this MR do and why?

This cleans up the code quality walkthrough experiment, as it lost to the control. For details see: #327229 (closed)

This is basically a revert of !58900 (merged)

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.