fix: Adaptation for the Course Authoring problems structure

[Inferato]

Description

This is a backport MR to the master branch.

Course Authoring provides a new way to problem creation. However, it has a slightly different XML structure and that affects the Problem Response report content:

Deadline

None

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[mphilbrick211]

Hi @Inferato! Flagging a failing check here - would you mind taking a look?

[connorhaugh]

We should maybe look at implementing a solution in frontend-lib-content-components as opposed to here on the backend.

[mphilbrick211]

We should maybe look at implementing a solution in frontend-lib-content-components as opposed to here on the backend.

@Inferato - flagging this for you!

[mariajgrimaldi]

Hi there @Inferato! We usually backport PR(s) after their corresponding master PR is merged. So we'll review this contribution against quince.master once that happens. Also, you should take a look at Connor's suggestion above. Thanks!