remove tdont_be_stupid, fixes #10386

tests/parallel/tdont_be_stupid.nim

@@ -1,23 +0,0 @@
-discard """
-output: '''
-100
-200
-300
-400
-'''
-"""
-
-import threadpool, os
-
-proc single(time: int) =
-  sleep time
-  echo time
-
-proc sleepsort(nums: openArray[int]) =
-  parallel:
-    var i = 0
-    while i <= len(nums) + -1:
-      spawn single(nums[i])
-      i += 1
-
-sleepsort([400,100,300,200])