Ctrl+C does not exit cleanly

[mineugene]

Background jobs remain when cancelling execution of script during package id validation.

[mineugene]

Although the remaining O(N) background jobs are cleaned, it is still possible for 1 background job to slip through and stay unremoved. Aborting the script while the tasks are being created in the foreach loop does not catch the lastest job created.

foreach ($a in $ArgsList) {
  # last background job not appended on abort :(
  $tasks += start-job -argumentlist $a -scriptblock $Cmd
}

To recreate issue, press Ctrl+C while before the ellipsis appears