Need a way to configure a maximum job name length

[gold2718]

Some machines limit the maximum length of a job name and submissions will fail if a longer name is used.
Currently, there is one supported CESM machine (Pleiades) that has this requirement and the job name length is enforced in the code using a hard-coded name match (editorial note, WTF?).
The suggested fix is to add a new, optional attribute in config_machines.

Reported by a CESM 2.0 user who does not thing modifying python code is the best way to add a machine.

[rljacob]

From telecon: need to add item to schema for machine about job name length.

[github-actions]

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