mediawiki phpunit no more use ant and LOG!

Phasing out the calls to the ant build script, similar to how it has
been done with the regressions tests.  Side effect is that we will have
a debug log file which is archived for each build AND we get some more
warnings.

Jobs updated:

mediawiki-core-phpunit-api
mediawiki-core-phpunit-databaseless
mediawiki-core-phpunit-misc
mediawiki-core-phpunit-parser

bug: 55595
Change-Id: I1b7242a6e6601b5e5c069fa4fb8759599b6d99d6