message: add a missing related type constraint to bootstrap schema
diff: @@ -229,6 +229,11 @@ const models = [
  id: 'types',
  attributes: {
  'field-type': '@cardstack/core-types::has-many'
  + },
  + relationships: {
  + 'related-types': {
  + data: [{ type: 'content-types', id: 'content-types' }]
  + }
  }
  },
  {
  