message: make manager a tagless component
diff: +import { tagName } from '@ember-decorators/component';
  import Component from '@ember/component';
  -
  import { layout } from 'ember-osf-web/decorators/component';
  import template from './template';
  @layout(template)
  +@tagName('')
  export default class ContributorsManager extends Component {
  }
  