Add more profiling regions in multisystem mode

Description

This makes interpreting profiling results easier for multisystem runs. The profiling regions contain the system name as well as, e.g., the name of the algorithmic step.

News snippet

Add more profiling regions in multisystem mode

Checklist

• I have checked that my code follows the Octopus coding standards
• I have added tests for all the new features added in this request.