Include health monitor information for testing

[karencfv]

Once we have health monitor types done, we'll want to be able to include them in testing as well. Would be good to integrate with the simulated omicron in SledAgent::new_simulated_with_id(), in nexus/inventory/src/examples.rs sled_agent() , and in nexus/reconfigurator/planning/src/system.rs Sled::new_simulated() as well