Fixes #19789 - fix Layout/SpaceAroundOperators cop

Fixes #23254 - Utilize webmock to prevent network connection

in tests

fixes #16557 - move tests into modern Rails layout

Models, controllers, mailers and helpers are now in test/ subdirs
matching app/ subdirs. Service, miscellaneous and old test/lib/ tests
are now in test/unit/ separated from models, which obsoletes the custom...