Add system checks to dashboard in admin UI (#15989)

app/controllers/admin/dashboard_controller.rb

@@ -3,13 +3,8 @@ require 'sidekiq/api'
 
 module Admin
   class DashboardController < BaseController
-    SIDEKIQ_QUEUES = %w(default push mailers pull scheduler).freeze
-
     def index
-      missing_queues = Sidekiq::ProcessSet.new.reduce(SIDEKIQ_QUEUES) { |queues, process| queues - process['queues'] }
-
-      flash.now[:alert] = I18n.t('admin.dashboard.misconfigured_sidekiq_alert', queues: missing_queues.join(', ')) unless missing_queues.empty?
-
+      @system_checks         = Admin::SystemCheck.perform
       @users_count           = User.count
       @pending_users_count   = User.pending.count
       @registrations_week    = Redis.current.get("activity:accounts:local:#{current_week}") || 0