chore: remove React 16.4's obsolete React imports (#28571)

Signed-off-by: hainenber <dotronghai96@gmail.com>

superset-frontend/src/SqlLab/components/ResultSet/ResultSet.test.tsx

@@ -16,7 +16,6 @@
  * specific language governing permissions and limitations
  * under the License.
  */
-import React from 'react';
 import { render, screen, waitFor } from 'spec/helpers/testing-library';
 import configureStore from 'redux-mock-store';
 import { Store } from 'redux';