[Test] Add ability to specify applicability of diagnostic to module or file

compiler/testData/codegen/box/traits/multipleImplFromJava.kt

@@ -1,4 +1,5 @@
 // TARGET_BACKEND: JVM
+// JVM_TARGET: 1.8
 // FILE: I.java
 interface I {
     default String ifun() { return "fail"; }
@@ -13,7 +14,6 @@ public class Z {
 public class Zz extends Z implements I {}
 
 // FILE: multipleImplFromJava.kt
-// JVM_TARGET: 1.8
 
 class Cc : Zz()