Running Ruby linter for all repos that have Ruby code

Added jobs for repos:

mediawiki/core
ArticleFeedbackv5
Math
MultimediaViewer
PageTriage
UploadWizard
WikiLove
ZeroBanner

See also:

https://gerrit.wikimedia.org/r/#/c/150189/

Bug: 63469
Change-Id: If2cde320e03163f7fdc767920b56898642883ac5