Issue #3458403: Conditionally disable access to update manager routes

Closes #3458403

core/modules/update/src/Access/UpdateManagerAccessCheck.php

@@ -8,6 +8,11 @@
 
 /**
  * Determines whether allow authorized operations is set.
+ *
+ * @deprecated in drupal:11.1.0 and is removed from drupal:12.0.0. There is no
+ *   replacement.
+ *
+ * @see https://www.drupal.org/node/3458658
  */
 class UpdateManagerAccessCheck implements AccessInterface {
 
@@ -35,6 +40,7 @@ public function __construct(Settings $settings) {
    *   The access result.
    */
   public function access() {
+    @trigger_error('The ' . __METHOD__ . ' method is deprecated in drupal:11.1.0 and is removed from drupal:12.0.0. There is no replacement. See https://www.drupal.org/node/3458658', E_USER_DEPRECATED);
     // Uncacheable because the access result depends on a Settings key-value
     // pair, and can therefore change at any time.
     return AccessResult::allowedIf($this->settings->get('allow_authorize_operations', TRUE))->setCacheMaxAge(0);