Add jobs for Wikidata build repo

Creates:

mwext-Wikidata-client-nonexperimental-tests
mwext-Wikidata-client-tests
mwext-Wikidata-repo-nonexperimental-tests
mwext-Wikidata-repo-tests

Change-Id: Ic74f12f533d33539939d6ffef0be012953c4e553