Redirect with interstitial when trying to view a remote collection while logged out (#38941)

app/controllers/redirect/collections_controller.rb

@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+
+class Redirect::CollectionsController < Redirect::BaseController
+  private
+
+  def set_resource
+    @resource = Collection.find(params[:id])
+    not_found if @resource.local? || @resource&.account&.suspended?
+  end
+end