_renderEntityGroupRow(item, headings) {
    const entityColumnHeading = {...headings[0]};
    // In subitem-situations (unused-javascript), ensure Entity name is not rendered as code, etc.
    entityColumnHeading.valueType = 'text';
    const groupedRowHeadings = [entityColumnHeading, ...headings.slice(1)];
    const fragment = this._dom.createFragment();
    fragment.append(this._renderTableRow(item, groupedRowHeadings));
    this._dom.find('tr', fragment).classList.add('lh-row--group');
    return fragment;
  }
Renders an entity-grouped row.
@param {TableItem} item
@param {LH.Audit.Details.TableColumnHeading[]} headings