[K/N][Tests] Migrate objcSmoke & objcTests tests

^KT-61259

native/native.tests/testData/interop/objc/tests/utils.kt

@@ -0,0 +1,19 @@
+@file:OptIn(FreezingIsDeprecated::class, ObsoleteWorkersApi::class)
+
+import kotlinx.cinterop.*
+import kotlin.native.concurrent.*
+import objcTests.*
+
+fun Worker.runInWorker(block: () -> Unit) {
+    block.freeze()
+    val future = this.execute(TransferMode.SAFE, { block }) {
+        it()
+    }
+    future.result // Throws on failure.
+}
+
+fun nsArrayOf(vararg elements: Any): NSArray = NSMutableArray().apply {
+    elements.forEach {
+        this.addObject(it as ObjCObject)
+    }
+}