Summary
We need to track challenge close, expiry, and error events in the editing funnel. @DLynch suggested that we log these in VisualEditorFeatureUse. (The schema name isn't entirely accurate, as it is also used for understanding wikitext editor events.)
Acceptance criteria
- Challenge close, expiry, and error events are logged into VisualEditorFeatureUse, with the editing session ID so they can be joined with other events