Add support for bisect bots to post results to dashboard.

High level changes:

update_bug_with_results.py
  - Removed the need to query rietveld, buildbucket, and buildbots.  This will make it simpler.  We want to get all the necessary results in one place which is from the bots.
  - Removed tracking infra failure.  Current method is not very reliable.
  - TryJobs now do not get removed.

post_bisect_results.py
  - To make it simple, we verify the data, and save it directly to a datastore JSONProperty.

bisect_report.py
  - This is where we create report base on TryJob states, whether they failed, staled, or completed.

try_job.py
  - Added 'results_data' which is data directly from bisect bots.
  - Added a 'staled' state.

BUG=catapult:#1869

Review URL: https://codereview.chromium.org/1566013002