FEATURE: Add ability to dismiss admin notices (#28916)

his is a new feature that lets admins dismiss notices from the dashboard. This helps with self-service in cases where a notice is "stuck", while we work on provisions to prevent "sticking" in the first place.

app/controllers/admin/admin_notices_controller.rb

@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+
+class Admin::AdminNoticesController < Admin::StaffController
+  def destroy
+    AdminNotices::Dismiss.call do
+      on_success { render(json: success_json) }
+      on_failure { render(json: failed_json, status: 422) }
+    end
+  end
+end