trigger mw-tools-release-phplint

mediawiki/tools/release used the python-lint templates to trigger pep8
and pyflakes jobs.  Due to a bug in Zuul (bug 50112), templates always
override jobs in the pipelines they define, so I had to expand the
template.

Anyway, PHP linting is enabled now.

Change-Id: Ib4371a26c7ea86711beb70800356a899805fd7ed