[Improvement] Remove NoMono categories

[asbjornu]

I think we can remove the NoMono category from our tests now, see shouldly/shouldly#376 (comment).

[stale]

This issue has been automatically marked as stale because it has not had recent activity. After 30 days from now, it will be closed if no further activity occurs. Thank you for your contributions.

[asbjornu]

This was resolved in #3002.

[arturcic]

🎉 This issue has been resolved in version 6.0.0 🎉
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