prefer interface as super method when class extends unrelated class and interface (IDEA-99347)

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/genericsHighlighting/IDEA99347.java

@@ -0,0 +1,12 @@
+interface Errors {
+  java.util.Collection<java.lang.String> getErrorMessages();
+
+}
+
+class Test extends AbstrClass implements Errors {
+}
+
+
+abstract class AbstrClass {
+  public java.util.Collection getErrorMessages() {return null;}
+}