[C2] Quiz: reimplement export all result functionnality from 1.11.x #6837
Description
In Chamilo 2 on the administration page in the "Sessions management" section there is a "Export all results from an exercise" entry that points to /main/admin/export_exercise_results.php
The file public/main/admin/export_exercise_results.php does not exist in Chamilo 2. It is present in Chamilo 1.11.x
This issue is the import this file in Chamilo 2 and adapt it if necessary to make the functionnality work in Chamilo 2.