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

prepare/compiler/build.gradle.kts

@@ -77,7 +77,6 @@ val distMavenContents by configurations.creating {
 val distCommonContents by configurations.creating
 val distStdlibMinimalForTests by configurations.creating
 val buildNumber by configurations.creating
-val distJSContents by configurations.creating
 
 val compilerBaseName = name
 
@@ -214,8 +213,6 @@ dependencies {
 
         distStdlibMinimalForTests(project(":kotlin-stdlib-jvm-minimal-for-test"))
 
-        distJSContents(project(":kotlin-stdlib", configuration = "distJsContent"))
-
         distCommonContents(project(":kotlin-stdlib", configuration = "commonMainMetadataElements"))
         distCommonContents(project(":kotlin-stdlib", configuration = "metadataSourcesElements"))
     }
@@ -442,18 +439,12 @@ val distMaven = distTask<Sync>("distMaven") {
     from(distMavenContents)
 }
 
-val distJs = distTask<Sync>("distJs") {
-    destinationDir = File("$distDir/js")
-    from(distJSContents)
-}
-
 distTask<Copy>("dist") {
     destinationDir = File(distDir)
 
     dependsOn(distKotlinc)
     dependsOn(distCommon)
     dependsOn(distMaven)
-    dependsOn(distJs)
     dependsOn(distSbomTask)
 
     from(buildNumber)