Fix all small and medium-sized issues after review

libraries/tools/kotlin-maven-plugin-test/src/it/test-executeKotlinScriptWithTemplate/script.kts

@@ -1,5 +1,9 @@
+import java.lang.Exception
 
 if (!args.isEmpty())
     println("some args passed")
 
+if (this !is org.jetbrains.kotlin.script.util.StandardScript)
+    throw Exception("Unexpected script base class")
+
 println("Hello from Kotlin script file!")