mw regressions tests were lacking test reports

Simply had to publish the phpunit Junit log.

Jobs updated:

mediawiki-core-regression-REL1_19
mediawiki-core-regression-REL1_20
mediawiki-core-regression-REL1_21
mediawiki-core-regression-master

bug: 51716
Change-Id: Ibb373f36625201889577b0321fd73dae535a9192