Added ExpiringProScheduler with email for expired GabPRO users

• Added:
- ExpiringProScheduler with email for expired GabPRO users

app/workers/expire_account_pro_worker.rb

@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+class ExpireAccountProWorker
+  include Sidekiq::Worker
+
+  sidekiq_options queue: 'mailers', retry: 2
+
+  attr_reader :user
+
+  def perform(acct_id)
+    @acct = Account.find(acct_id)
+    @acct.update(is_pro: false)
+
+    deliver_email
+  end
+
+  private
+
+  def deliver_email
+    UserMailer.pro_expired(@acct.user).deliver_now!
+    @acct.user.touch(:last_emailed_at)
+  end
+end