Running Ruby linter for all repos that have Ruby code

Created jobs:

mediawiki-core-ruby1.9.3lint
mwext-ArticleFeedbackv5-ruby1.9.3lint
mwext-Math-ruby1.9.3lint
mwext-MultimediaViewer-ruby1.9.3lint
mwext-PageTriage-ruby1.9.3lint
mwext-UploadWizard-ruby1.9.3lint
mwext-WikiLove-ruby1.9.3lint
mwext-ZeroBanner-ruby1.9.3lint

See also:

https://gerrit.wikimedia.org/r/#/c/150177/

Bug: 63469
Change-Id: Iecbc0d3ef7834fb08c683114386bcd0f7e33cdd2