[Gradle, JS] Fix upper case names in js files, decamelize instead

^KT-43237 fixed

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/npm/NpmProject.kt

@@ -127,6 +127,12 @@ open class NpmProject(@Transient val compilation: KotlinJsCompilation) {
 
         val targetName = if (target.name.isNotEmpty() && target.name.toLowerCase() != "js") {
             target.name
+                .replace(DECAMELIZE_REGEX) {
+                    it.groupValues
+                        .drop(1)
+                        .joinToString(prefix = "-", separator = "-")
+                }
+                .toLowerCase()
         } else null
 
         return sequenceOf(
@@ -146,5 +152,7 @@ open class NpmProject(@Transient val compilation: KotlinJsCompilation) {
         const val PRE_PACKAGE_JSON = "pre-package.json"
         const val NODE_MODULES = "node_modules"
         const val DIST_FOLDER = "kotlin"
+
+        private val DECAMELIZE_REGEX = "([A-Z])".toRegex()
     }
 }