Resolve #3472868 "Switch to dex"

Closes #3472868

bin/sm

-#!/usr/bin/env php
-<?php
-
-declare(strict_types = 1);
-
-use Composer\Autoload\ClassLoader;
-use Drupal\Core\DrupalKernel;
-use Drupal\Core\Site\Settings;
-use Symfony\Component\Console\Application;
-use Symfony\Component\HttpFoundation\Request;
-
-// We have the luxury of using this global.
-# https://getcomposer.org/doc/articles/vendor-binaries.md#finding-the-composer-autoloader-from-a-binary
-require_once dirname($GLOBALS['_composer_autoload_path']) . '/autoload_runtime.php';
-
-if ('cli' !== \PHP_SAPI) {
-  throw new Exception('This script must be run from the command line.');
-}
-
-// Utilizes the https://symfony.com/doc/current/components/runtime.html component
-// to encapsulate the application cleanly.
-return static function (array $context): Application {
-  $loaders = ClassLoader::getRegisteredLoaders();
-  $classLoader = reset($loaders);
-
-  // Discovery can get out of whack if cleared caches and try to run this
-  // command without a web request priming discovery.
-  chdir(\DRUPAL_ROOT);
-  $kernel = new DrupalKernel('prod', $classLoader, FALSE);
-  $kernel::bootEnvironment();
-  $kernel->setSitePath($context['DRUPAL_DEV_SITE_PATH'] ?? 'sites/default');
-  Settings::initialize($kernel->getAppRoot(), $kernel->getSitePath(), $classLoader);
-  $kernel->boot();
-
-  // Drupal is highly dependent on a Request:
-  $request = Request::createFromGlobals();
-  $kernel->getContainer()
-    ->get('request_stack')
-    ->push($request);
-  // This sets things up, esp loadLegacyIncludes().
-  $kernel->preHandle($request);
-
-  $app = new Application('sm', \Drupal::VERSION);
-  // A container technique like Symfony.
-  $app->add($kernel->getContainer()->get('console.command.messenger_consume_messages'));
-  return $app;
-};