Testbed to read service IDs from more than just services.yml

[ivalaginja]

The testbed explicitly collects all service IDs found in services.yml:

catkit2/catkit2/testbed/testbed.py

Line 176 in 781ce37

for service_id, service_info in self.config['services'].items():

This happens in a couple more places in catkit2/testbed/testbed.py and in catkit2/testbed/testbed_proxy.py.

I am trying to come up with a way where I could have the testbed collect service IDs from more than just the services configuration. In particular, we have so many individual motor services on THD2 that I would like to separate them out into a file like motors.yml. It seems like it should be easy to optionally pass additional config keys that would also be used as a source for service IDs. I am just still trying to figure out how to implement that without a change that is too invasive, and most of all keep things working with the current default setup.

I also just saw there's some of that in catkit_core/Service.cpp:

catkit2/catkit_core/Service.cpp

Line 30 in 781ce37

m_Config = m_Testbed->GetConfig()["services"][service_id];

So I might have to be more careful with that.