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

compiler/testData/codegen/box/jvm8/javaDefaults/defaultMethodOverride.kt

@@ -1,4 +1,5 @@
 // TARGET_BACKEND: JVM
+// JVM_TARGET: 1.8
 // FILE: Simple.java
 
 public interface Simple {
@@ -8,7 +9,6 @@ public interface Simple {
 }
 
 // FILE: main.kt
-// JVM_TARGET: 1.8
 
 interface KInterface: Simple {
     override fun test(s: String): String {