drupal_container() is deprecated, and all calls in the user module need to be replaced with Drupal::service(), except for where the module_handler service is requested, which needs to be replaced with Drupal::moduleHandler() (see #1957154: Replace calls to drupal_container()->get('module_handler') service with Drupal::moduleHandler())
This task a part of #2001206: [META] Replace drupal_container() with Drupal::service()
