Remove usages of JVM target 1.6 from compiler tests

#KT-45165

libraries/tools/kotlin-main-kts-test/testData/compiler-options.main.kts

@@ -0,0 +1,18 @@
+@file:CompilerOptions("-jvm-target", "1.8", "-Xabi-stability=unstable")
+
+interface Test {
+    fun print()
+    fun printSuper() = println("Hi from super")
+}
+
+class TestImpl : Test {
+    override fun print() = println("Hi from sub")
+}
+
+inline fun printRandom() = println("Hi from random")
+
+TestImpl().run {
+    print()
+    printSuper()
+    printRandom()
+}