This ticket is to add in tracking of sister projects and positions into event logging for tests such as T160004
It would be nice to have a list of sister results and their positions as extraParams to SERP events so we can tell from TSS2 data which projects were shown to the user without having to merge with search logs. For example:
[{"result":"image","position":0},
{"result":"book","position":1},
{"result":"course","position":2}]