FEATURE: Merge discourse-automation (#26432)

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

plugins/automation/lib/discourse_automation/triggers/stalled_topic.rb

@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+key = "discourse_automation.triggerables.stalled_topic.durations"
+ids = %w[PT1H P1D P1W P2W P1M P3M P6M P1Y]
+duration_choices = ids.map { |id| { id: id, name: "#{key}.#{id}" } }
+
+DiscourseAutomation::Triggerable.add(DiscourseAutomation::Triggers::STALLED_TOPIC) do
+  field :categories, component: :categories
+  field :tags, component: :tags
+  field :stalled_after, component: :choices, extra: { content: duration_choices }, required: true
+
+  placeholder :topic_url
+end