Added fake override search in unused symbol inspection #KT-13288 Fixed

idea/testData/quickfix/removeUnused/javaTriangle.before.Main.kt

@@ -0,0 +1,13 @@
+// "Safe delete 'something'" "false"
+// ACTION: Convert function to property
+// ACTION: Convert member to extension
+// ACTION: Convert to block body
+// ACTION: Move to companion object
+// ACTION: Specify return type explicitly
+
+abstract class Abstract {
+    fun <caret>something() = "hi"
+}
+
+class Test: Abstract(), Inter {
+}