[Chiatana's Colossal Coaster]: Update Tests to Verify Queue has been Updated

[lukemcguire]

Description

In Chaitana's Colossal Coaster, the test for taskno=6 only checked that the correct name was returned, it did not verify that the queue was updated to remove the last person from the queue. This change adds a second test to taskno=6 to validate the queue.

Checklist before requesting review

• Discussed the issue with one of the maintainers (@BethanyG )
• Verified the test file runs against the exemplar.py file with no issues

[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!

[BethanyG]

🎉

[BethanyG]

Wow. All that convo and I didn't merge. APOLOGIES. Merging now. Thank you for submitting this!! 🎉