label some jobs needing PHPUnit

We now have PHPUnit deployed on all slaves (bug 54762 and bug 56317),
some jobs using PHPUnit were not being applied the 'hasPhpUnit' which
would prevent them from running on all slaves.

Jobs updated:

mediawiki-core-regression-REL1_19
mediawiki-core-regression-REL1_20
mediawiki-core-regression-REL1_21
mediawiki-core-regression-REL1_22
mediawiki-core-regression-master
mwext-Wikibase-client-tests
mwext-Wikibase-repo-tests
mwext-Wikibase-repoapi-tests

bug: 53594
Change-Id: I5c164190ec0b32dae5f36550c201b93f9de1c395