Skip Discobot flag tutorial if `allow_flagging_staff` is disabled.

https://meta.discourse.org/t/interacting-with-discobot/96574

plugins/discourse-narrative-bot/lib/discourse_narrative_bot/new_user_narrative.rb

@@ -95,6 +95,7 @@ module DiscourseNarrativeBot
       },
 
       tutorial_flag: {
+        prerequisite: Proc.new { SiteSetting.allow_flagging_staff },
         next_state: :tutorial_search,
         next_instructions: Proc.new { I18n.t("#{I18N_KEY}.search.instructions", base_uri: Discourse.base_uri) },
         flag: {

plugins/discourse-narrative-bot/spec/discourse_narrative_bot/new_user_narrative_spec.rb

@@ -401,6 +401,22 @@ describe DiscourseNarrativeBot::NewUserNarrative do
 
             expect(narrative.get_data(user)[:state].to_sym).to eq(:tutorial_flag)
           end
+
+          describe 'when allow_flagging_staff is false' do
+            it 'should go to the right state' do
+              SiteSetting.allow_flagging_staff = false
+              post.update!(raw: skip_trigger)
+
+              DiscourseNarrativeBot::TrackSelector.new(
+                :reply,
+                user,
+                post_id: post.id
+              ).select
+
+              expect(narrative.get_data(user)[:state].to_sym)
+                .to eq(:tutorial_search)
+            end
+          end
         end
       end