[Swarming] Adds Response proto & improves "unscheduled task" logic

[IvanBM18]

It was request for me to add a log to easily debug when swarming scheduled a task.But i noticed we didnt had the protos for parsing the response, hence i added them.

Also this PR handles an edge case in which swarming will not return a task_id if the tasks wasn't scheduled.

Changes

• Adds the missing swarming_task_response proto
  • Ran protos/generate.sh which updated a ton of files
• The swarming service now marks tasks as not scheduled when no task_id is found, task_id cannot be found if swarming didn't queue the task, because of wrong dimensions or other swarming internal reasons

Note:

This Pr is a draft because is dependent of this other PR