media entity browser base view is missing
No, the Media Entity Browser is still in contrib. If you are using core media then use the 2.x branch, see https://www.drupal.org/project/media_entity_browser. If this is only about the question in the title, see Revert views missing. Any workarounds? how to import a View from a module folder. If the View is missing you don't need to look for the UUID of the existing View.