Update Arrow-Atomic

[nomisRev]

Closes #3144, #3145, #3146, #3147.

Also replaces any usage of Atomic with Int to AtomicInt.

[serras]

Let's get this one and #3224 merged first, since they are more or less self-contained.

Then my plan is to push a change that adds kotlin.test to every library test source set, so that we don't have 10000 different ways of adding the library. WDYT?

[github-actions]

Kover Report

File	Coverage [14.29%]
arrow-libs/fx/arrow-fx-coroutines/src/commonTest/kotlin/arrow/fx/coroutines/Platform.kt	14.29%

Total Project Coverage	54.19%

[serras]

After quite some investigation, it seems that runTest doesn't work exactly as runBlocking in Native. But on the other hand runBlocking is not available in JS... So I ended up doing a "run one in Native and the other in the rest".

It seems everything works alright if the "skip delays" is disabled.