fix(chart table in dashboard): improve screen reading of table (#26453)

Co-authored-by: Elizabeth Thompson <eschutho@gmail.com>

superset-frontend/plugins/plugin-chart-table/src/DataTable/DataTable.tsx

@@ -16,6 +16,7 @@
  * specific language governing permissions and limitations
  * under the License.
  */
+
 import React, {
   useCallback,
   useRef,