Issue #3260698: Make it simpler to disable validators in tests

tests/modules/automatic_updates_test_disable_validators/src/AutomaticUpdatesTestDisableValidatorsServiceProvider.php

-<?php
-
-namespace Drupal\automatic_updates_test_disable_validators;
-
-use Drupal\Core\DependencyInjection\ContainerBuilder;
-use Drupal\Core\DependencyInjection\ServiceProviderBase;
-use Drupal\Core\Site\Settings;
-
-/**
- * Allows specific validators to be disabled by site settings.
- *
- * This should only really be used by functional tests. Kernel tests should
- * override their ::register() method to remove service definitions; build tests
- * should stay out of the API/services layer unless absolutely necessary.
- */
-class AutomaticUpdatesTestDisableValidatorsServiceProvider extends ServiceProviderBase {
-
-  /**
-   * {@inheritdoc}
-   */
-  public function alter(ContainerBuilder $container) {
-    $validators = Settings::get('automatic_updates_disable_validators', []);
-    array_walk($validators, [$container, 'removeDefinition']);
-  }
-
-}