Outages for non-UC generators

[llavin13]

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Is your feature request related to a problem? Please describe.
My understanding after talking with @m-bossart is outages can only be applied to units with an OnVariable (i.e., UC, must-run excluded). Generally, I'd like to have the ability to apply outages to all generators :)

Describe the solution you'd like
It seems like if there is some kind of collection of all non-UC gens (including Renewables,Hydro), it'd be great if an outage representation worked for those.

Describe alternatives you've considered
I'm OK to use the current implementation so I'll go with that for now.

Additional context
Add any other context or screenshots about the feature request here.

[jd-lara]

My understanding after talking with @m-bossart is outages can only be applied to units with an OnVariable (i.e., UC, must-run excluded). -> This is not totally accurate. In the feature branch we haven't implemented outages in all unit categories to QA/QC thermals. The limitation with must_run has more to do with a formulation clash since in those cases we eliminate a large number of constraints and variables.

@llavin13 Generally, I'd like to have the ability to apply outages to all generators :) -> Just unset the flag must_run for those generators.