The "group_content" entity type does not exist + content_lock module

Problem/Motivation

When upgrading group v2 -> v3 with the "content_lock" module you may run into the following error trying to run database updates:

> In EntityTypeManager.php line 139:
>                                                    
>   The "group_content" entity type does not exist.  
>                                                    

Steps to reproduce

Install and configure group v2 and the content lock module (maybe workbench also?)
Follow steps for group v2 -> v3 migration
Potentially re-run the update on a fresh database to re-create the error

Proposed resolution

* Nothing to do here at least from a code perspective. Just wanted to document our fix.

You can run a drush command similar to this to basically "unset" this config:
drush cset content_lock.settings types.group_content null

... or put the following in an update hook that will run before getting the error

  $config_factory = \Drupal::configFactory();
  $config = $config_factory->getEditable('content_lock.settings');
  $config->set('types.group_content', null);
  $config->save(TRUE);

Remaining tasks

none