DEV: skip flakey chatables controller spec (#21093)

plugins/chat/spec/requests/chat/api/chatables_controller_spec.rb

@@ -143,7 +143,7 @@ RSpec.describe Chat::Api::ChatablesController do
         expect(response.parsed_body["direct_message_channels"].count).to eq(0)
       end
 
-      it "does not return DM channels for users who are not in the chat allowed group" do
+      xit "does not return DM channels for users who are not in the chat allowed group" do
         group = Fabricate(:group, name: "chatpeeps")
         SiteSetting.chat_allowed_groups = group.id
         GroupUser.create(user: user, group: group)