"subscribe" sidekiq queue has been renamed to "interactive".

This is a better description: this queue is for jobs initiated by the user and that should be given priority to give him as much a feeling of interactivity as possible.
Clear the testing job queue of all Sidekiq workers before each RSpec test.

See: https://github.com/mperham/sidekiq/wiki/Testing#testing-worker-queueing-fake
When a User instance is destroyed, the Sidekiq worker DestroyUserWorker is enqueued, instead of the deprecated Resque job.
When the user requests an OPML export, the new ExportSubscriptionsWorker Sidekiq worker is enqueued, instead of the deprecated Resque job.