GitLab

Removing the isolate.py functionality and requiring tasks to be created from an archive hash rather than an isolate file.

Also adding back the controller_test.py and isolate files which were missed in the refactor cl due to a bad move. The only change to these files are to support isolate hashes rather than isolate files.

BUG=460340

Review URL: https://codereview.chromium.org/943923003

Cr-Commit-Position: refs/heads/master@{#317703}