Cover more upgrade paths

- [x] Script to generate dummy site using old branch
- [x] Check: Quiz configuration is upgraded correctly
- [x] Check: Number of quiz is not changed
- [x] Check: Number of questions per type is not changed
- [x] Check: quiz node's fields data is migrated correctly.
- [x] Missing update: Question node -> question entity
- [x] upgrade question node details
- [x] update question reference columns
- Migrate views, follow #51