Add consistency check between exam mode exercise variants

[krusche]

It would be great if Artemis can check the consistency between exam mode exercise variants on the exercise groups page. For each exercise group the following checks could be implemented, ideally we start simple and iterate over this multiple times

Do all exercises have the same config?

For programming exercises, this could include different options such as

• same programming language and same project type
• static code analysis enabled/disabled
• same build config (build script, docker image, etc.)
• same dependency version (e.g. Gradle Wrapper, Gradle dependencies in Java) in the different repos
• similar problem statement length
• same grading config (e.g. related to tests and to submission policies)

For quiz exercises, this could include

• same number of questions
• same question types
• similar amount of answer options / dnd items / sa items

There should be a button in the exercise group header to trigger the check. Ideally it is automatically executed when opening the page and in case there are inconsistencies a warning triangle is shown. If there are no inconsistencies, a green checkmark is shown