win: enable job tests that use jobstart only

- echo "" does not hang in powershell
    - cmd.exe's echo command does not hang.
    - job tests default to powershell (WHY?)
- wait 5 seconds for powershell to create an empty file
    - powershell is slow
    - cannot reliably validate the id returned by jobstart via jobpid, jobstop
    - if using cmd.exe, waiting for a second should be enough
- remaining job tests are unreliable in Windows because any build can pass/fail
  for same conditions without changes, especially if the error is in stderr

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