FEATURE: Merge discourse-automation (#26432)

Automation (previously known as discourse-automation) is now a core plugin.

plugins/automation/lib/discourse_automation/engine.rb

@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+module ::DiscourseAutomation
+  class Engine < ::Rails::Engine
+    engine_name PLUGIN_NAME
+    isolate_namespace DiscourseAutomation
+  end
+
+  def self.filter_by_trigger(items, trigger)
+    trigger = trigger&.to_sym
+
+    indexed_items =
+      items.each_with_object({}) do |item, acc|
+        if item[:triggerable] == trigger || item[:triggerable].nil?
+          acc[item[:name]] = item if acc[item[:name]].nil? || item[:triggerable] == trigger
+        end
+      end
+
+    indexed_items.values
+  end
+end