rubocop and lint for all repos having Ruby code

Create rubocop jobs using the bundle job template.

Explicitly set each of them as non voting since none of the repositories
pass rubocop checks.

Also added a mwext-ZeroPortal-ruby1.9.3lint

Created jobs:

VisualEditor-bundle-rubocop
mediawiki-core-bundle-rubocop
mediawiki-ruby-api-bundle-rubocop
mediawiki-selenium-bundle-rubocop
mwext-ArticleFeedbackv5-bundle-rubocop
mwext-CirrusSearch-bundle-rubocop
mwext-ContentTranslation-bundle-rubocop
mwext-Echo-bundle-rubocop
mwext-Flow-bundle-rubocop
mwext-GettingStarted-bundle-rubocop
mwext-Math-bundle-rubocop
mwext-MobileFrontend-bundle-rubocop
mwext-MultimediaViewer-bundle-rubocop
mwext-PageTriage-bundle-rubocop
mwext-PdfHandler-bundle-rubocop
mwext-Translate-bundle-rubocop
mwext-TwnMainPage-bundle-rubocop
mwext-UniversalLanguageSelector-bundle-rubocop
mwext-UploadWizard-bundle-rubocop
mwext-VisualEditor-bundle-rubocop
mwext-WikiLove-bundle-rubocop
mwext-ZeroBanner-bundle-rubocop
mwext-ZeroPortal-bundle-rubocop
mwext-ZeroPortal-ruby1.9.3lint

Bug: 69245
Change-Id: I061f10cccaf5e91f807b627904ac9bdb54111acc