Extract EE-specific code from GroupMemberPolicy

Signed-off-by: Rémy Coutable <remy@rymai.me>

app/policies/group_member_policy.rb

@@ -21,12 +21,6 @@ class GroupMemberPolicy < BasePolicy
   rule { is_target_user }.policy do
     enable :destroy_group_member
   end
-
-  ## EE extensions
-
-  condition(:ldap, score: 0) { @subject.ldap? }
-  condition(:override, score: 0) { @subject.override? }
-
-  rule { ~ldap }.prevent :override_group_member
-  rule { ldap & ~override }.prevent :update_group_member
 end
+
+GroupMemberPolicy.prepend(EE::GroupMemberPolicy)

ee/app/policies/ee/group_member_policy.rb

+# frozen_string_literal: true
+
+module EE
+  module GroupMemberPolicy
+    extend ActiveSupport::Concern
+
+    prepended do
+      condition(:ldap, score: 0) { @subject.ldap? }
+      condition(:override, score: 0) { @subject.override? }
+
+      rule { ~ldap }.prevent :override_group_member
+      rule { ldap & ~override }.prevent :update_group_member
+    end
+  end
+end