Merge branch 'remove_group_sync_class' into 'master'

Change `LdapGroupSync` worker to use new Group Sync classes

This was missed before - somehow 😞 The old `group_sync` class was left and the worker still pointed to it. Unfortunately, this means that 8.11 shipped with the new modular code but it is not in use. In the interest of not introducing a possible regression, we may as well wait until 8.11. 



See merge request !601

CHANGELOG-EE

@@ -2,6 +2,7 @@ Please view this file on the master branch, on stable branches it's out of date.
 
 v 8.11.0 (unreleased)
   - Performance improvement of push rules
+  - Change LdapGroupSyncWorker to use new LDAP group sync classes
 
 v 8.10.3 (unreleased)
   - Fix regression in Git Annex permission check

app/workers/ldap_group_sync_worker.rb

@@ -5,7 +5,7 @@ class LdapGroupSyncWorker
 
   def perform
     logger.info 'Started LDAP group sync'
-    EE::Gitlab::LDAP::GroupSync.execute
+    EE::Gitlab::LDAP::Sync::Groups.execute
     logger.info 'Finished LDAP group sync'
   end
 end