[Test] Move KotlinAgainstKotlin tests under BlackBoxCodegen tests

compiler/testData/codegen/box/compileKotlinAgainstKotlin/kt14012_multi.kt

@@ -0,0 +1,23 @@
+// TARGET_BACKEND: JVM
+// MODULE: lib
+// FILE: A.kt
+@file:JvmName("TTest")
+@file:JvmMultifileClass
+package test
+
+var property = "fail"
+    private set
+
+fun test() {
+    property = "OK"
+}
+
+// MODULE: main(lib)
+// FILE: B.kt
+
+import test.*
+
+fun box(): String {
+    test()
+    return property
+}