Add exercise results to short test imports

[Dudrie]

:ticket: Description

As of right now the import of a short test only imports the sum of points for each student. This is due to the lack of total points being for exercises not being part of the Ilias export (however the points a student has achieved in an exercise are part of the export).

There should be a way to import the results split into the exercises so tutors can have a better understanding of what a student did wrong without the need to look it up in the Ilias list.

[create-issue-branch[bot]]

Branch issue-817-Add_exercise_results_to_short_test_imports created!