[FIR] Forbid typeRef-named labels without +ContextReceivers

^KT-63068 Fixed

compiler/testData/diagnostics/tests/extensions/contextReceivers/noLabelsByClassName.fir.kt

@@ -1,28 +1,28 @@
 // ISSUE: KT-63068
 fun Int.f() {
-    this@Int
+    this<!UNRESOLVED_LABEL!>@Int<!>
 }
 
 var Int.p: Int
     get() {
-        this@Int
+        this<!UNRESOLVED_LABEL!>@Int<!>
         <!RETURN_NOT_ALLOWED!>return@p<!> 42
     }
     set(value) {
-        this@Int
+        this<!UNRESOLVED_LABEL!>@Int<!>
     }
 
 class X {
     var Int.p: Int
         get() {
-            this@Int
+            this<!UNRESOLVED_LABEL!>@Int<!>
             <!RETURN_NOT_ALLOWED!>return@p<!> 42
         }
         set(value) {
-            this@Int
+            this<!UNRESOLVED_LABEL!>@Int<!>
         }
 
     fun Int.f() {
-        this@Int
+        this<!UNRESOLVED_LABEL!>@Int<!>
     }
 }