Introduce Parameter: Suggest removing extension receiver which becomes unused after new parameter is added

idea/testData/refactoring/introduceParameter/unusedExtensionReceiver.kt

@@ -0,0 +1,14 @@
+// WITH_RUNTIME
+// WITH_DEFAULT_VALUE: false
+class A(val n: Int)
+
+fun A.foo(): Int {
+    return <selection>n + 1</selection>
+}
+
+fun test() {
+    A(1).foo()
+    with(A(1)) {
+        foo()
+    }
+}