Remove Salmon and PubSubHubbub (#11205)

* Remove Salmon and PubSubHubbub endpoints

* Add error when trying to follow OStatus accounts

* Fix new accounts not being created in ResolveAccountService

app/workers/after_remote_follow_worker.rb

@@ -5,27 +5,5 @@ class AfterRemoteFollowWorker
 
   sidekiq_options queue: 'pull', retry: 5
 
-  attr_reader :follow
-
-  def perform(follow_id)
-    @follow = Follow.find(follow_id)
-    process_follow_service if processing_required?
-  rescue ActiveRecord::RecordNotFound
-    true
-  end
-
-  private
-
-  def process_follow_service
-    follow.destroy
-    FollowService.new.call(follow.account, updated_account.acct)
-  end
-
-  def updated_account
-    @_updated_account ||= FetchRemoteAccountService.new.call(follow.target_account.remote_url)
-  end
-
-  def processing_required?
-    !updated_account.nil? && updated_account.locked?
-  end
+  def perform(follow_id); end
 end