Gradle, native: Don't treat test output as stacktrace

Currently native test runner reports stacktraces using TC
service messages.

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/native/tasks/KotlinNativeTest.kt

@@ -83,7 +83,7 @@ open class KotlinNativeTest : KotlinTest() {
             name,
             testNameSuffix = targetName,
             prependSuiteName = targetName != null,
-            treatFailedTestOutputAsStacktrace = true,
+            treatFailedTestOutputAsStacktrace = false,
             stackTraceParser = ::parseKotlinNativeStackTraceAsJvm
         )