[K/N] Migrate some cinterop tests to new test infra

kotlin-native/backend.native/tests/interop/leakMemoryWithRunningThread/unchecked.kt

@@ -1,29 +0,0 @@
-@file:OptIn(kotlin.experimental.ExperimentalNativeApi::class, kotlin.native.runtime.NativeRuntimeApi::class)
-
-import leakMemory.*
-import kotlin.concurrent.AtomicInt
-import kotlin.native.concurrent.*
-import kotlin.native.Platform
-import kotlin.test.*
-import kotlinx.cinterop.*
-
-val global = AtomicInt(0)
-
-fun ensureInititalized() {
-    // Only needed with the legacy MM. TODO: Remove when legacy MM is gone.
-    kotlin.native.initRuntimeIfNeeded()
-    // Leak memory
-    StableRef.create(Any())
-    global.value = 1
-}
-
-fun main() {
-    Platform.isMemoryLeakCheckerActive = true
-    kotlin.native.runtime.Debugging.forceCheckedShutdown = false
-    assertTrue(global.value == 0)
-    // Created a thread, made sure Kotlin is initialized there.
-    test_RunInNewThread(staticCFunction(::ensureInititalized))
-    assertTrue(global.value == 1)
-    // Now exiting. With unchecked shutdown, we exit quietly, even though there're
-    // unfinished threads with runtimes.
-}