Moved tests to WikiLove repository

See also the commit[1] in WikiLove repository that moves the tests there and the commit[2] in mediawiki/selenium repository that documents changes in Jenkins jobs.

1: https://gerrit.wikimedia.org/r/#/c/113104/
2: https://gerrit.wikimedia.org/r/#/c/113107/

Bug: 61135
Change-Id: Ibb794fe9f77a501fa251f768317673a0e5a20fcc
Merge "Moved tests to WikiLove repository"