DEV: skip edit message test until new service added to chat (#259)

Temporarily skip the edit chat message test as we are moving MessageUpdate to a new service in Chat.

spec/lib/modules/toxicity/entry_point_spec.rb

@@ -52,7 +52,7 @@ describe DiscourseAi::Toxicity::EntryPoint do
       end
     end
 
-    context "when editing a chat message" do
+    xcontext "when editing a chat message" do
       # This fabricator trigger events because it uses the MessageCreator.
       # Using let makes the test fail.
       fab!(:chat_message) { Fabricate(:chat_message) }