[JS IR] Don't generate "import" statements for external interfaces

#KT-40964 fixed

js/js.translator/testData/box/jsQualifier/interfaces.kt

@@ -0,0 +1,43 @@
+// EXPECTED_REACHABLE_NODES: 1238
+// FILE: bar.kt
+@file:JsQualifier("foo")
+package foo
+
+external interface Bar {
+    fun ping(): String
+}
+
+// FILE: baz.kt
+package boo
+
+external interface Baz {
+    fun pong(): Int
+}
+
+// FILE: root.kt
+import foo.Bar
+import boo.Baz
+
+external val bar: Bar
+external val baz: Baz
+
+// FILE: test.kt
+fun box(): String {
+    if (bar.ping() != "ping" || baz.pong() != 194) return "Fail"
+
+    return "OK"
+}
+
+// FILE: test.js
+
+var bar = {
+    ping() {
+        return "ping"
+    }
+};
+
+var baz = {
+    pong() {
+        return 194
+    }
+};