ActiveJobs: Add 'hold' and 'release' buttons.

[brianmcmichael]

Add buttons allowing the user to put one of their jobs on hold or release it.

┆Issue is synchronized with this Asana task by Unito

[ericfranz]

This should go near (but not too close to) the button to delete the job. Have it be yellow :-). Note, maybe check and make sure that holding a job is a valid step if the job is in queue and running states for Torque and others before doing this. Of course, release should only be a button if the job is being held.

[matt257]

reviewed as a team; still a good idea

prioritized for the future