Clean up `network/service.rs` #4213

Job	Run time
check-no-std	1m 31s
check-rustdoc-links	48s
cargo-deny (bans licenses sources)	25s
check-features	3m 3s
clippy	43s
fmt	34s
fuzzing-binaries-compile	4m 43s
test-32bits	6m 15s
test-64bits	6m 26s
wasm-node-check	2m 5s
cargo-spellcheck	35s
wasm-node-versions-match	30s
all-ci	1s
	27m 39s

Provide feedback