Present a random selection of questions when a survey is part of a sequence

[smirolo]

When implementing tests during a course/sequence, we want to select a subset of all the questions in a campaign associated to the survey attached to the PageElement in a sequence (say 5 out of 20) for testing the user (see also #431 correct answers).

It might be possible to implement this functionality as part of SampleRecentCreateAPIView, though my guess is different end point might be necessary. to investigate.