Avoid full references search for languages without PsiClass (KT-14974)

Make smart type search work for Groovy.

 #KT-14974 Fixed

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

@@ -4,4 +4,6 @@
 public class JavaClass {
     public void <caret>invoke() {
     }
+
+    public static class OtherJavaClass extends JavaClass {}
 }