Only execute tested functions during evaluation

[lars-vc]

When turning in a piece of code with a testcase included, dodona runs this testcase and this blocks the rest of the code from working, this only seems to happen with javascript exercises, with python ones the test cases just get ignored.

https://dodona.ugent.be/nl/submissions/5392008/

This can be annoying to constantly comment the testcases after finding a small mistake.

[chvp]

Moving this to https://github.com/dodona-edu/judge-javascript since it will have to be solved there (if we decide to do so).