Use `buf.build` to manage our protobuf related activities #4784

Job	Run time
run-determination	1s
build (internal/arduino/discovery/discovery_client)	23s
build (rpc/internal/client_example)	25s
check-config (./)	12s
build (commands/term_example)	31s
check-formatting (./)	13s
check-license-headers (./)	16s
check-outdated (./)	18s
check-style (./)	54s
	3m 13s

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