"Find Usages": add tests for Kotlin usages of Java declarations

idea/testData/findUsages/java/findJavaMethodUsages/JKMethodOverrides.0.java

@@ -0,0 +1,14 @@
+// PSI_ELEMENT: com.intellij.psi.PsiMethod
+// OPTIONS: overrides
+public class A {
+    public void <caret>foo() {
+
+    }
+}
+
+public class B extends A {
+    @Override
+    public void foo() {
+
+    }
+}