Migrate boxWithJava tests to multi-file framework

compiler/testData/codegen/boxWithJava/javaProperty/boxedSetter.kt

@@ -0,0 +1,28 @@
+// FILE: JavaClass.java
+
+public class JavaClass {
+
+    private boolean value;
+
+    public boolean isValue() {
+        return value;
+    }
+
+    public void setValue(Boolean value) {
+        this.value = value;
+    }
+}
+
+// FILE: kotlin.kt
+
+fun box(): String {
+    val javaClass = JavaClass()
+
+    if (javaClass.isValue != false) return "fail 1"
+
+    javaClass.isValue = true
+
+    if (javaClass.isValue != true) return "fail 2"
+
+    return "OK"
+}