PHP Lint jobs for phabricator/* repositories

Adds a basic php linting job to the phabricator repositories:

phabricator/arcanist
phabricator/extensions/BurnDownCharts
phabricator/libphutil
phabricator/phabricator
phabricator/test
phabricator/tools

Bug: 68263
Change-Id: I409c98e795594e36806dc8e81c1f45601d23d40b