new phpcs jobs for mediawiki/core (non voting)

Introduce the lenient/strict phpcs jobs to mediawiki/core. Would
eventually let us have the strict job voting.

Also made the voting/file limiter to apply on any of the new phpcs jobs.

bug: 48420
Change-Id: Icd506fe020dccbb007c7557849bcdd9450d69dbb
trigger mwext-UniversalLanguageSelector-ruby1.9.3lint

Change-Id: I6b36610b47797cdab8af0ffbec9c06fe4f61605b
whitelist Moriel Schottlender

Moriel is participating in Google Summer of Code for the Visual Editor
team.

bug: 53440
Change-Id: I4de4bc3c86c941d344abbb1c1919165b151aaf96