Build: Rework runtimeJar helper and drop redundant configuration

#KTI-559

plugins/scripting/scripting-compiler-impl-embeddable/build.gradle.kts

@@ -1,12 +1,11 @@
-import com.github.jengelman.gradle.plugins.shadow.tasks.ShadowJar
-
-plugins { java }
-
 description = "Kotlin Compiler Infrastructure for Scripting for embeddable compiler"
 
-val packedJars by configurations.creating
+plugins {
+    java
+}
+
 dependencies {
-    packedJars(project(":kotlin-scripting-compiler-impl")) { isTransitive = false }
+    embedded(project(":kotlin-scripting-compiler-impl")) { isTransitive = false }
     runtimeOnly(project(":kotlin-scripting-common"))
     runtimeOnly(project(":kotlin-scripting-jvm"))
     runtimeOnly(kotlinStdlib())
@@ -14,11 +13,6 @@ dependencies {
 
 publish()
 
-noDefaultJar()
-runtimeJar(rewriteDepsToShadedCompiler(
-    tasks.register<ShadowJar>("shadowJar")  {
-        from(packedJars)
-    }
-))
+runtimeJar(rewriteDefaultJarDepsToShadedCompiler())
 sourcesJar()
 javadocJar()