["Request"] Remove dependency on kotlinx-coroutines-test

[ansman]

What version are you currently using?
1.1.5

What would you like to see?
Currently, arrow-fx-coroutines depends on kotlinx-coroutines-test. This bad since it's a test dependency and shouldn't be pulled in to production code. I don't even see a reason why it would be pulled in, there are no imports used in arrow-fx-coroutines as far as I can see: https://github.com/search?q=repo%3Aarrow-kt%2Farrow+%22kotlinx.coroutines.text%22&type=code

[nomisRev]

Oof, that is definitely a mistake that somehow leaked in. That should absolutely be removed.