[K/N][Tests] Support test directive ASSERTIONS_MODE

^KT-64844 Fixed

native/native.tests/testData/standalone/termination/assertFailed.kt

@@ -1,8 +0,0 @@
-// EXIT_CODE: !0
-@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class)
-
-// TODO: Test running this test with disabled assertions. This requires removing always-enabled
-//       -enable-assertions from `BasicCompilation`.
-fun main() {
-    assert(false)
-}

native/native.tests/testData/standalone/termination/assertPassed.kt

@@ -1,5 +0,0 @@
-@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class)
-
-fun main() {
-    assert(true)
-}