Added second quickfix on conflicting extension to mark it hidden and deprecated

idea/testData/quickfix/migration/conflictingExtension/wrongExplicitThis.kt

@@ -0,0 +1,7 @@
+// "Delete redundant extension property" "false"
+// ACTION: Convert property to function
+
+class C : Thread() {
+    val Thread.<caret>priority: Int
+        get() = this@C.getPriority()
+}