Revert "Ensure actioncable connection is not a pinned connection"

This reverts commit 3311ca0.

Rails 7.2.3 is released and contains this change so we can drop this patch

See: rails/rails@3e6e684

Author: jrafanie

lib/extensions/ac_subscription_adapter_postgresql.rb

@@ -1,7 +1,6 @@
 require "manageiq/ui/classic/engine"
 require "manageiq/ui/classic/version"
 require "extensions/ac_nested_params"
-require "extensions/ac_subscription_adapter_postgresql"
 
 module ManageIQ
   module UI