Extract Function: Generate function in property's enclosing declaration if original expression belongs to initializer of that property

#KT-6290 Fixed

idea/testData/refactoring/extractFunction/duplicates/insertBeforeDuplicates.kt.after

@@ -1,8 +1,8 @@
 fun foo() {
-    fun i(): Int {
-        return 1 + 1
-    }
-
     val x = i()
     val y = i()
+}
+
+private fun i(): Int {
+    return 1 + 1
 }