rra/ilgonmic/after-test-promise

[JS] Node downloading for js ir integration kotlin test

[JS] Fix API of Promise

[JS IR] Promise symbol as lazy2

[JS] Support legacy compiler aftertest with promises

[JS IR] Generate finally for promised tests

[JS] Setup it tests for JS IR kotlin-test

Merge-request: KT-MR-5168

^KT-49738 fixed

libraries/stdlib/js/src/kotlin/promise.kt

@@ -20,6 +20,8 @@ public open external class Promise<out T>(executor: (resolve: (T) -> Unit, rejec
 
     public open fun <S> catch(onRejected: (Throwable) -> S): Promise<S>
 
+    public open fun finally(onFinally: () -> Unit): Promise<T>
+
     companion object {
         public fun <S> all(promise: Array<out Promise<S>>): Promise<Array<out S>>