MDL-73112 reportbuilder: improve handling of concatenated columns.

This change overcomes limitations in certain DB engines (such as
MySQL[1]) which can lead to truncation of data when applying group
concatenation to columns.

Ensure we account for that by validating that we are able to extract
the expected number of fields from each concatenated value.

[1] https://dev.mysql.com/doc/refman/5.7/en/server-system-variables.html#sysvar_group_concat_max_len

reportbuilder/amd/src/report.js

@@ -21,6 +21,7 @@
  * @license     http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
+import Notification from 'core/notification';
 import * as reportEvents from 'core_reportbuilder/local/events';
 import * as reportSelectors from 'core_reportbuilder/local/selectors';
 import {setPageNumber, refreshTableContent} from 'core_table/dynamic';
@@ -58,7 +59,8 @@ export const init = () => {
         const pageNumber = event.detail?.preservePagination ? null : 1;
 
         await setPageNumber(tableRoot, pageNumber, false)
-            .then(refreshTableContent);
+            .then(refreshTableContent)
+            .catch(Notification.exception);
     });
 
     // Listen for trigger popup events.