[Feature]: Extend the process manager and controller code to be able to log on the relevant server

[PawelPlesniak]

Description

Define an RPC for each server to execute a log. This will primarily be used for

• Recording the entry/exit of various error states
• Writing custom messages that the integration tests can use to speed up parsing logfiles for specific conditions and parsing various tables.

Potential impact radius

Small/Isolated

Reason for change

Makes it clearer what the cause of failure modes are
Allows for general bookkeeping

Suggested implementations

N/A

Testing suggestions

Run the unified shell and use the log command to see if the requested message is posted at the requested severity.

Anything else?

N/A