Display ongoing outage information prominently

[retzkek]

If there's an ongoing outage/degradation for jobsub/batch system, it would be very useful to users to display that somewhere prominently on the POMS interface, perhaps a banner.

Outage information is in SNOW and Landscape, I'd probably want to put it into Lens to provide a consistent API. In any case it should just be a GET request away.

[marcmengel]

I should note that in the early designs, you could (manually) hold (queue) all POMS launches for job submission or storage major outages, and then release them all later when things woke up; I think that code is still lurking in the corners somewhere; we could have whatever watches for outages and reports them also hold POMS launches until the outage is resolved, if the outage would otherwise make job launches fail...

https://github.com/fermitools/poms/blob/main/webservice/SubmissionsPOMS.py#L983