KT-62004 Drop legacy JS build of kotlin-stdlib

- preserve kotlin-stdlib-js.jar in dist and maven
- change packaging to klib in .pom
- fix manifest attributes of kotlin-stdlib-js

repo/artifacts-tests/src/test/resources/org/jetbrains/kotlin/kotlin-stdlib-js/kotlin-stdlib-js.pom

@@ -10,6 +10,7 @@
   <groupId>org.jetbrains.kotlin</groupId>
   <artifactId>kotlin-stdlib-js</artifactId>
   <version>ArtifactsTest.version</version>
+  <packaging>klib</packaging>
   <name>Kotlin Stdlib Js</name>
   <description>Kotlin Standard Library for JS</description>
   <url>https://kotlinlang.org/</url>