make gigasecond wip

[oxe-i]

Makes gigasecond wip until we can find a solution to it timing out in the online editor. Also makes some small changes in the imports of the test file, just in case it makes a difference.

[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.

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[no important files changed]

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