[ui] [improvement] Filter out batch-child jobs

[IainSteers]

Nomad version

Nomad v0.7.0

Operating system and Environment details

Ubuntu 16.04

Issue

Right now the jobs table in the UI is horrifically over-populated, with even a couple of periodic jobs in our environment.

Quickly building up a pile of dead periodic jobs, makes the only reasonable use of the table, directly search for your job.

We'd appreciate it if you could group batch child jobs under their triggering parent, and hide them by default, or alternatively provide a checkbox or similar show periodic jobs.

[github-actions]

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