Fix `Debug*` gRPC function calls implementation #4609

Job	Run time
run-determination	1s
check-formatting (./)	8s
check-outdated (./)	14s
check-style (./)	49s
check-config (./)	11s
build (internal/arduino/discovery/discovery_client)	16s
check-license-headers (./)	17s
build (rpc/internal/client_example)	24s
build (commands/term_example)	29s
	2m 49s

Provide feedback