Move JVM specific proto comparison tests to separate dir

Original commit: 5dd4e4cdd4

jps/jps-plugin/testData/comparison/jvmOnly/classToFileFacade/old.kt

@@ -0,0 +1,13 @@
+package test
+
+public class TestPackage {
+    public fun main() {}
+}
+
+public class MainKt {
+    companion object {
+        @JvmStatic
+        public fun main() {
+        }
+    }
+}