Refactor script-util context tools to simplify its usage in the new scripting

libraries/tools/kotlin-script-util/src/test/kotlin/org/jetbrains/kotlin/script/util/ScriptUtilContextTests.kt

@@ -24,7 +24,7 @@ class ScriptUtilContextTests {
     @Test
     fun testExplicitScriptClasspath() {
         withSysProp(KOTLIN_SCRIPT_CLASSPATH_PROPERTY, "a:b:c") {
-            val classpath = scriptCompilationClasspathFromContext()
+            val classpath = scriptCompilationClasspathFromContextOrStlib(wholeClasspath = true)
             Assert.assertEquals("a:b:c", classpath.joinToString(":"))
         }
     }