Change Details

ImageBrowsing and StickyHeaders experiments are complete: remove instrumentation code from WikmediaEvents. ==Acceptance criteria [] remove [imageBrowsingPageVisit.js](https://gerrit.wikimedia.org/r/plugins/gitiles/mediawiki/extensions/WikimediaEvents/+/master/modules/ext.wikimediaEvents/xLab/imageBrowsingPageVisit.js) [] remove [stickyHeaders.js](https://gerrit.wikimedia.org/r/plugins/gitiles/mediawiki/extensions/WikimediaEvents/+/master/modules/ext.wikimediaEvents/xLab/stickyHeaders.js) [] remove [loggedOutPageVisit.js](https://gerrit.wikimedia.org/r/plugins/gitiles/mediawiki/extensions/WikimediaEvents/+/master/modules/ext.wikimediaEvents/xLab/loggedOutPageVisit.js) [] check for any relevant leftovers