Migrate boxWithJava tests to multi-file framework

compiler/testData/codegen/boxWithJava/fileClasses/javaAnnotationOnFileFacade.kt

@@ -0,0 +1,19 @@
+// FILE: StringHolder.java
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Target(ElementType.TYPE)
+@Retention(RetentionPolicy.RUNTIME)
+public @interface StringHolder {
+    public String value();
+}
+
+// FILE: fileFacade.kt
+
+@file:StringHolder("OK")
+
+fun box(): String =
+        Class.forName("FileFacadeKt").getAnnotation(StringHolder::class.java)?.value ?: "null"