Use The new Rails error reporter

[morgoth]

The built-in error reporter is now available in Rails. https://edgeguides.rubyonrails.org/error_reporting.html

It should simplify and cleanup the integration for the rollbar gem. There is already an error tracker that is integrated with it, vide https://github.com/getsentry/sentry-ruby/blob/master/sentry-rails/lib/sentry/rails/error_subscriber.rb