Remove `g_edit_by_live_preview`
Problem
In !131045 (merged) it was found that event g_edit_by_live_preview
is actually never triggered anywhere.
Desired Outcome
g_edit_by_live_preview
is removed.
Possible Solution
To keep our metrics definitions accurately reflecting reality we should mark the metric which only relies on g_edit_by_live_preview
as removed and remove the event from all aggregated metrics it's currently part of.