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/fib.pkg.kts

@@ -0,0 +1,11 @@
+package kotlin.scripting.fibonacci
+// this script expected parameter num : Int
+
+fun fib(n: Int): Int {
+    val v = if(n < 2) 1 else fib(n-1) + fib(n-2)
+    println("fib($n)=$v")
+    return v
+}
+
+println("num: $num")
+val result = fib(num)