Specify upper bound on compute time

[caufieldjh]

We don't want a NEAT job to take forever - it's expensive - so we will need some way to stop a job if it takes more than n hours.
This will need to be independent of the NEAT config so individual users don't just set it arbitrarily.

[caufieldjh]

An area where templates may help (see https://cloud.google.com/compute/docs/instance-templates)

[justaddcoffee]

Discussing this again with @caufieldjh and @hrshdhgd - we will eventually want to set this limit to prevent very long GCP jobs

[caufieldjh]

This could also be handled by the scheduler, as it's otherwise just sitting in a Jenkins pipeline waiting for a return from GCP