Refactor mutation events registration by moving reusable code from relevant steps to EventUti

Related discussion where the conclusion was made to relax individual steps based on necessity: https://lists.apache.org/thread/vjbjh29kwjhd5lcmkqqqqrhw7rw2ynh9

Signed-off-by: Oleksandr Porunov <alexandr.porunov@gmail.com>
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