settings: add `connection_timeout` #4874

Job	Run time
run-determination	1s
build (internal/arduino/discovery/discovery_client)	18s
check-config (./)	9s
build (rpc/internal/client_example)	25s
build (commands/term_example)	25s
check-formatting (./)	20s
check-license-headers (./)	14s
check-outdated (./)	10s
check-style (./)	43s
	2m 45s

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