[analyze][rearchitecture] Reduce delays on untrusted parts of analyze

[jonathanmetzman]

Instead of preprocessing and then putting on the queue for scheduling, schedule right away. This eliminates up to 1 minute of time spent pulling tasks from the queue and can improve execution speed on batch by:

1. Allowing us to set a higher priority for the job.
2. Causing batch to schedule the job earlier because the job requires less CPUs than jobs with many tasks. These CPUs may not be available in times of high-usage.