Add additional timestamp fields

[nuclearcat]

We need to track more events during some of the jobs:
1)How long task spend in "queued" state (as k8s cluster might be too busy), so we need ts_start_queued, ts_start_running
2)Same for tests, DUT might not be immediately available, and task will stay in queue

So total ts required: queued, running, completed
Will help also to estimate ETA when task start running.