Disable non-voting VPP jobs preparing to make them periodic

Disable non-voting VPP jobs preparing to make them periodic

- Original attempt to convert non-voting jobs [0] failed when
  applied while non-voting jobs were executing and was reverted.
  This patch is a refactoring of [0] which disables non-voting job
  triggers.  After it has been merged and all non-voting jobs
  have completed and the trigger disabling verified, another
  patch will be pushed which enables commented out triggers.

  [0] https://gerrit.fd.io/r/c/ci-management/+/31105

Signed-off-by: Dave Wallace <[email protected]>
Change-Id: I4cc2de88e21f6ed3e2b7bb43494c760fcd27519c