Bind web UI access tokens to sessions (#3940)

* Add overview of active sessions

* Better display of browser/platform name

* Improve how browser information is stored and displayed for sessions overview

* Fix test

* Fix #2347 - Bind web UI access token to session

When you logout, session also destroys the access token, so it's no longer
valid. If access token is destroyed some other way, the session is also
destroyed, requiring a re-login.

Fix #1681 - Add scheduler to remove revoked access tokens and grants

* Fix test

app/workers/scheduler/doorkeeper_cleanup_scheduler.rb

@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+require 'sidekiq-scheduler'
+
+class Scheduler::DoorkeeperCleanupScheduler
+  include Sidekiq::Worker
+
+  def perform
+    Doorkeeper::AccessToken.where('revoked_at IS NOT NULL').where('revoked_at < NOW()').delete_all
+    Doorkeeper::AccessGrant.where('revoked_at IS NOT NULL').where('revoked_at < NOW()').delete_all
+  end
+end