[JS IR] Support external delegation in case of JS in psi2ir

- fix FE delegation resolver
 - fix critical KT-40650

js/js.translator/testData/box/delegation/delegationToExternaInterface.kt

@@ -1,6 +1,9 @@
 // EXPECTED_REACHABLE_NODES: 1236
 // KJS_WITH_FULL_RUNTIME
 // KT-40126
+
+// MODULE: lib
+// FILE: l.kt
 @file:Suppress("EXTERNAL_DELEGATION")
 
 @Suppress("NESTED_CLASS_IN_EXTERNAL_INTERFACE")
@@ -12,4 +15,9 @@ external interface MySymbolConstructor {
     operator fun invoke(description: String = definedExternally): Any
 }
 
-fun box() = "OK"
+// MODULE: main(lib)
+// FILE: f.kt
+
+fun foo(ee: MySymbol?) = "OK"
+
+fun box() = foo(null)