Add queue start latency report

A new report has been added:

lava_queue_latency_seconds{device_type=DEVICE_TYPE,submitter=SUBMITTER,priority=PRIORITY}

Signed-off-by: Corentin Noël <corentin.noel@collabora.com>
2 jobs for tintou/latency in 6 minutes and 16 seconds (queued for 1 second)
latest
Status Name Job ID Coverage
  Build
passed build monitor #100933
heavyweight

00:03:54

 
  Docker
passed docker image #100934

00:02:21