add a bunch of extensions

- ApprovedRevs
- Configure
- DiscussionThreading
- EditCount
- GoogleSiteSearch
- Lingo
- NewestPages
- NewUserNotif

Jenkins jobs with https://gerrit.wikimedia.org/r/#/c/71059/

Change-Id: I967dcb5a00bb98f7192f4dad29c7e5d80e357cf0