CLONE - Feedback activity with more than 60 questions work

Test on Mysql

1. Create a feedback with over 60 questions - you can use the attached backups or export file
2. Complete feedback as several students - answer first, middle and last questions
3. As a teacher make sure that you can view and download responses (except PDF)
4. Repeat with non-anonymous feedback

FYI: The attached backups have 150 questions and 250 users - this is necessary to test "chunking" of both questions and users during export

Note: No need to test downloading the response in PDF format as it will take a very long time to be generated and it might fail.