[Gradle, JS] Fix once initialization of produceExecutable

#KT-38055 fixed

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/Kotlin2JsGradlePluginIT.kt

@@ -81,13 +81,13 @@ class Kotlin2JsIrGradlePluginIT : AbstractKotlin2JsGradlePluginIT(true) {
         val appProject = transformProjectWithPluginsDsl(
             projectName = "app",
             directoryPrefix = rootProjectName,
-            wrapperVersion = GradleVersionRequired.AtLeast("5.3")
+            wrapperVersion = GradleVersionRequired.AtLeast("5.5")
         )
 
         val libProject = transformProjectWithPluginsDsl(
             projectName = "lib",
             directoryPrefix = rootProjectName,
-            wrapperVersion = GradleVersionRequired.AtLeast("5.3")
+            wrapperVersion = GradleVersionRequired.AtLeast("5.5")
         )
 
         libProject.gradleProperties().appendText(jsCompilerType(KotlinJsCompilerType.IR))

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/js-composite-build/app/build.gradle.kts

@@ -8,10 +8,17 @@ repositories {
     mavenCentral()
 }
 
-kotlin.js {
-    binaries.executable()
-    nodejs()
-    browser()
+kotlin {
+    js {
+        nodejs()
+        binaries.executable()
+    }
+}
+kotlin {
+    js {
+        browser()
+        binaries.executable()
+    }
 }
 
 tasks.named("browserTest") {

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

@@ -57,9 +57,12 @@ abstract class KotlinJsIrSubTarget(
         }
     }
 
-    internal val produceExecutable: () -> Unit by lazy {
+    private val produceExecutable: Unit by lazy {
         configureMain()
-        return@lazy { Unit }
+    }
+
+    internal fun produceExecutable() {
+        produceExecutable
     }
 
     override fun testTask(body: KotlinJsTest.() -> Unit) {

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/subtargets/KotlinJsSubTarget.kt

@@ -42,10 +42,14 @@ abstract class KotlinJsSubTarget(
 
     protected val taskGroupName = "Kotlin $disambiguationClassifier"
 
-    internal open fun produceExecutable() {
+    private val produceExecutable: Unit by lazy {
         configureMain()
     }
 
+    internal fun produceExecutable() {
+        produceExecutable
+    }
+
     internal fun configure() {
         NpmResolverPlugin.apply(project)