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/compiler/smoke_exception.kts

@@ -0,0 +1,11 @@
+@file:DependsOn("@{kotlin-stdlib}")
+
+fun main() {
+    error("my error")
+}
+
+fun a() {
+    main()
+}
+
+a()