Note in logs when runner manager is being unregistered

Pedro Pombeirorequested to merge
pedropombeiro/change-unregister-runner-manager-log-output into main

What does this MR do?

Note in logs when runner manager is being unregistered

Makes it possible to distinguish from when the runner itself is unregistered

Why was this MR needed?

What's the best way to test this MR?

What are the relevant issue numbers?

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