[FIR] Add UNCHECKED_CAST

Regenerate diagnostics code

compiler/testData/diagnostics/tests/callableReference/propertyOfNestedGenericClass.fir.kt

@@ -26,7 +26,7 @@ fun test() {
 
     c
 
-    val d = id(Scope.Nested<*>::keyT as Scope.Nested<Number>)
+    val d = id(Scope.Nested<*>::keyT <!UNCHECKED_CAST!>as Scope.Nested<Number><!>)
 
     d
 
@@ -40,4 +40,4 @@ fun justResolve() {
     val b = Scope.Nested<String>::keyT
     val c = Scope.Nested<*>::keyT
     val d = Scope.Nested<out Number?>::keyT
-}
+}