* Use the new mw.track() handlers from WikimediaEvents
* Ensure that 'integration' and 'mode' are set on init
events, since they're not guessed in the handler any more
* Remove the setting of 'editingStatsId' tracking parameter,
now happens in WikimediaEvents by setting an API AJAX option
* Replace ve.track with mw.track in VE-MW, so that we don't have
to copy the events manually here and in other extensions
This must be merged together with WikimediaEvents change
Iace4d53a972396ca5b8713000570cc47c9986034 (but we can't use
Depends-On, because CI requires code here to be removed first).
Bug: T332438
Change-Id: I0ef0a96aafdf89a4ebe32131a85b18c25744bb2c
