Built-ins in IDE: update tests

KT-33233

idea/testData/multiplatform/builtinsAndStdlib/js/js.kt

@@ -0,0 +1,14 @@
+// !DIAGNOSTICS: -UNUSED_VARIABLE
+
+package mpp
+
+fun jsFun() {
+}
+
+fun test() {
+    val string: String = ""
+    val ref: kotlin.reflect.KCallable<*> = ::jsFun
+    ref.name
+    // should be unresolved
+    ref.<!UNRESOLVED_REFERENCE!>call<!>()
+}