Runner: Show active job ID while waiting to queue next job

[briancain]

Is your feature request related to a problem? Please describe.

When Waypoint executes a job, and another job is queued for execution, the user has no information as to which job id is actively being waited on. This can be an issue if the job is in a bad state in the database and might be marked as still "running" when in reality it has exited and there is no running job.

Describe the solution you'd like

The CLI should show the job id it is waiting on while waiting to queue a new operation. Something like:

» Operation is queued waiting for job "123-456-789". Waiting for runner assignment...
  If you interrupt this command, the job will still run in the background.

Then, the user can inspect the state of the job and even cancel it if Waypoint has marked it in a "bad" state.

Note that this feature should probably come after a functional waypoint job CLI because otherwise the user won't have any tools to use the job id.

Describe alternatives you've considered
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Explain any additional use-cases
If there are any use-cases that would help us understand the use/need/value please share them as they can help us decide on acceptance and prioritization.

Additional context
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