Harmonize behavior for pdf/certificate generation between single trial/assignment courses and multi attempts exams courses

[kevinmulier]

Currently behavior is quite different between those 2 :

• It can create some issues (like with the share certificate page that broke for multi attempts exams)
• We have specific queries for each of them (more complexity)
• For pages/components that needs to show both single trial/assignment courses and multi-attempts, we have to create different behaviors