[Gradle, JS] Allow to create another binaries.executable

#KT-KT-38055 fixed

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/ir/KotlinJsBinaryContainer.kt

@@ -97,27 +97,41 @@ constructor(
         jsBinaryType: JsBinaryType,
         create: (compilation: KotlinJsCompilation, name: String, type: KotlinJsBinaryType) -> T
     ) {
-        types.forEach { buildVariantKind ->
+        types.forEach {
+            createBinary(
+                compilation,
+                it,
+                jsBinaryType,
+                create
+            )
+        }
+    }
+
+    private fun <T : JsBinary> createBinary(
+        compilation: KotlinJsCompilation,
+        type: KotlinJsBinaryType,
+        jsBinaryType: JsBinaryType,
+        create: (compilation: KotlinJsCompilation, name: String, type: KotlinJsBinaryType) -> T
+    ) {
         val name = generateBinaryName(
             compilation,
-                buildVariantKind,
+            type,
             jsBinaryType
         )
 
-            require(name !in binaryNames) {
+        if (name in binaryNames) {
-                "Cannot create binary $name: binary with such a name already exists"
+            return
         }
 
         binaryNames.add(name)
 
-            val binary = create(compilation, name, buildVariantKind)
+        val binary = create(compilation, name, type)
         add(binary)
         // Allow accessing binaries as properties of the container in Groovy DSL.
         if (this is ExtensionAware) {
             extensions.add(binary.name, binary)
         }
     }
-    }
 
     companion object {
         internal fun generateBinaryName(

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/ir/KotlinJsIrSubTarget.kt

@@ -57,8 +57,9 @@ abstract class KotlinJsIrSubTarget(
         }
     }
 
-    internal fun produceExecutable() {
+    internal val produceExecutable: () -> Unit by lazy {
         configureMain()
+        return@lazy { Unit }
     }
 
     override fun testTask(body: KotlinJsTest.() -> Unit) {