When I build Kotest I see a lot of warnings printed to the console. There are too many to be able to determine if any are significant, or any are irrelevant noise.

For example, some Kotest functions are deprecated. However, these functions themselves use deprecated functionality. It would make sense to suppress deprecation warnings for functions that are deprecated.

I would like to fix these warnings over the course of several PRs.

In order to make sure that warnings don't creep in again, I also propose enabling allWarningsAsErrors.