Have kotlin-compiler-embeddable copy sources and javadocs from kotlin-compiler

#KT-42183 Fixed

prepare/compiler-embeddable/build.gradle.kts

@@ -53,8 +53,17 @@ val runtimeJar = runtimeJar(embeddableCompiler()) {
     mergeServiceFiles()
 }
 
-sourcesJar()
+sourcesJar {
-javadocJar()
+    val compilerTask = project(":kotlin-compiler").tasks.named<Jar>("sourcesJar")
+    dependsOn(compilerTask)
+    from(compilerTask.map { zipTree(it.archiveFile) })
+}
+
+javadocJar {
+    val compilerTask = project(":kotlin-compiler").tasks.named<Jar>("javadocJar")
+    dependsOn(compilerTask)
+    from(compilerTask.map { zipTree(it.archiveFile) })
+}
 
 projectTest {
     dependsOn(runtimeJar)
@@ -67,4 +76,3 @@ projectTest {
     }
 }
 
-