IDE perf tests for K/N: keep Kotlin & Gradle versions in *.properties

idea/testData/perfTest/native/HelloWorld/src/test/HelloTest.kt

@@ -0,0 +1,11 @@
+import kotlin.test.Test
+import kotlin.test.assertTrue
+
+private const val GREETING = "Hello, Kotlin/Native!"
+
+class HelloTest {
+    @Test
+    fun testHello() {
+        assertTrue("Kotlin/Native" in GREETING)
+    }
+}

idea/testData/perfTest/native/HelloWorld/src/test/HelloTest2.kt

@@ -0,0 +1,11 @@
+import kotlin.test.Test
+import kotlin.test.assertTrue
+
+private const val GREETING = "Hello, Kotlin/Native!"
+
+class HelloTest2 {
+    @Test
+    fun testHello() {
+        assertTrue("Kotlin/Native" in GREETING)
+    }
+}

idea/testData/perfTest/native/HelloWorld/src/test/HelloTest3.kt

@@ -0,0 +1,11 @@
+import kotlin.test.Test
+import kotlin.test.assertTrue
+
+private const val GREETING = "Hello, Kotlin/Native!"
+
+class HelloTest3 {
+    @Test
+    fun testHello() {
+        assertTrue("Kotlin/Native" in GREETING)
+    }
+}