Simplify "Find Usages" test data, Move configuration options to test files

idea/testData/findUsages/findMethodUsages/javaAndKotlinOverrides.1.java

@@ -0,0 +1,6 @@
+class C extends A<String> {
+    @Override
+    public void foo(String s) {
+        super.foo(s);
+    }
+}