AbstractScriptConfigurationTest: rewrite script template setup

Allow simpler setup of common scenarios
Do not require to define DependenciesResolver for every test
Drop redundant template files

idea/testData/script/definition/highlighting/simple/script.kts

@@ -4,4 +4,6 @@ val g = listOf("a", "b", "c")
 
 val time = <error>measureNanoTime</error> {
     println("text")
-}
+}
+
+// DEPENDENCIES: classpath:runtime-classes