T402460 added instrumentation that enables us to track pastes during edit sessions that would have caused Paste Check to activate were it available.
This task involves the work of introducing a new event that would enable us to track Pastes that would not have caused Paste Check to activate, given how it is currently configured.
Story
As a data scientist and member of the Editing Team, I want to be able to track pastes that would have caused Paste Check had the text not been copied from a known source so that we can, among other things, understand how many edits Paste Check is being suppressed from showing witin.
Requirements
Building on the current relevant-paste event, we can also instrument when a paste is detected and check whether it's a paste that's (a) long enough to be shown as a paste check, and (b) would not have been shown as a paste check because it has a known-source.
We can log it as ignored-paste-[source], where source is currently one of googleDocs, libreOffice, microsoftOffice, plainText, and visualEditor.
As with the relevant-paste event, this would happen for all users, not just those on an a/b test wiki. The practical difference would be that since it's logging when paste check doesn't show, it'll also be appearing for a/b test wiki users who're in the test group (who don't get relevant-paste because they emit the normal check-shown event instead).