Remove nested describes to unbreak task-based testing

[IsaacG]

Fix issue where task based outputs do not work due to nested describe() calls. See Discord discussion.

[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]

For more information, refer to the documentation. If you are unsure whether to add the message or not, please ping @exercism/maintainers-admin in a comment. Thank you!

[Cool-Katt]

/format

[github-actions]

The "Format code" action has started running.

[Cool-Katt]

Hello, bots? Anyone there?

/format

[github-actions]

The "Format code" action has started running.

[Cool-Katt]

@IsaacG can you format this on your end?
The bot command fails because it doesn't like that the branch is named main.