Captain's Log: Fix random override cleanup

[SleeplessByte]

See: https://forum.exercism.org/t/tests-instructions-not-displayed/18559/6

(Do not merge quite yet, testing now locally if this actually solves it, will remove this message when done)

We also need a test-runner update for beforeEach per describe. Will fix that too.

Do not merge yet

When we merge this without updating the browser-test-runner, you won't be able to complete this in the browser anymore. Right now in the browser you can complete it by starting the tests 3x once it fails.

[github-actions]

This PR touches files which potentially affect the outcome of the tests of an exercise. This will cause all students' solutions to affected exercises to be re-tested.

If this PR does not affect the result of the test (or, for example, adds an edge case that is not worth rerunning all tests for), please add the following to the merge-commit message which will stops student's tests from re-running. Please copy-paste to avoid typos.

[no important files changed]

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