Draft: Uninstall kernel test

Allows testing uninstall of the module. According to https://api.drupal.org/api/drupal/core%21lib%21Drupal%21Core%21Extension%21ModuleInstaller.php/function/ModuleInstaller%3A%3Auninstall/9.4.x it will verify that created storage and fields are uninstalled properly.

I think without the install test, it doesn't do all that much, but once a test suite runs where the install happens then the removal would have something to check further.