FEATURE: Send a message to new TL2 users and point them to the advanced tutorial (#8335)

* FEATURE: Send a message to new TL2 users and point them to the advanced tutorial

* DEV: Use a method to find the discobot user

plugins/discourse-narrative-bot/autoload/jobs/send_advanced_tutorial_message.rb

@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+module Jobs
+  class SendAdvancedTutorialMessage < ::Jobs::Base
+    def execute(args)
+      user = User.find_by(id: args[:user_id])
+      raise Discourse::InvalidParameters.new(:user_id) if user.nil?
+
+      PostCreator.create!(
+        Discourse.system_user,
+        title: I18n.t("discourse_narrative_bot.tl2_promotion_message.subject_template"),
+        raw: I18n.t("discourse_narrative_bot.tl2_promotion_message.text_body_template"),
+        archetype: Archetype.private_message,
+        target_usernames: user.username,
+        skip_validations: true
+      )
+    end
+  end
+end

plugins/discourse-narrative-bot/autoload/jobs/send_default_welcome_message.rb

@@ -9,7 +9,7 @@ module Jobs
 
         title = I18n.t("system_messages.#{type}.subject_template", params)
         raw = I18n.t("system_messages.#{type}.text_body_template", params)
-        discobot_user = User.find(-2)
+        discobot_user = ::DiscourseNarrativeBot::Base.new.discobot_user
 
         post = PostCreator.create!(
           discobot_user,