Remove alpha experimental modules prior to beta1.

core/modules/config_environment/config_environment.info.yml

-name: 'Configuration Environment'
-type: module
-description: 'Allows administrators to manage configuration environments.'
-package: Core (Experimental)
-version: VERSION
-dependencies:
-  - drupal:config

core/modules/config_environment/config_environment.module

-<?php
-
-/**
- * @file
- * Allows site administrators to modify environment configuration.
- */
-
-use Drupal\Core\Routing\RouteMatchInterface;
-
-/**
- * Implements hook_help().
- */
-function config_environment_help($route_name, RouteMatchInterface $route_match) {
-  switch ($route_name) {
-    case 'help.page.config_environment':
-      $output = '';
-      $output .= '<h3>' . t('About') . '</h3>';
-      $output .= '<p>' . t('The Configuration Environment module provides a mechanism for handling configuration changes between different environments. For more information, see the <a href=":config_environment">online documentation for the Configuration Environment module</a>.', [':config_environment' => 'https://www.drupal.org/node/3047873']) . '</p>';
-      return $output;
-  }
-}