[WasmJs] Prohibit external classes to be a storage of an associated objects

Fix #KT-65355

compiler/testData/diagnostics/wasmTests/jsInterop/associatedObjects.kt

@@ -0,0 +1,21 @@
+// FIR_IDENTICAL
+@file:OptIn(ExperimentalAssociatedObjects::class)
+
+import kotlin.reflect.AssociatedObjectKey
+import kotlin.reflect.ExperimentalAssociatedObjects
+import kotlin.reflect.KClass
+import kotlin.reflect.findAssociatedObject
+
+@AssociatedObjectKey
+@Retention(AnnotationRetention.BINARY)
+annotation class X(val kClass: KClass<*>)
+
+object Promise
+
+<!ASSOCIATED_OBJECT_INVALID_BINDING!>@X(Promise::class)<!>
+external class Y
+
+external class OuterExternal {
+    <!ASSOCIATED_OBJECT_INVALID_BINDING!>@X(Promise::class)<!>
+    class NestedExternal
+}