Move compiler scripting tests to scripting plugin, remove unused funs

also remove some tests that are covered in the scripting-compiler
tests now.
Part of the cleanup to rewrite scripting to the new infrastructure.

plugins/scripting/scripting-compiler/testData/cliCompilation/hello_req.kt

@@ -0,0 +1,5 @@
+
+class RequiredFromHello {
+
+    val name = "required"
+}