chore(iroh-dns-server): cleanup some code #11263

Job	Run time
Android Build Only (aarch64-linux-android)	1m 32s
Android Build Only (armv7-linux-androideabi)	1m 35s
Cross Build Only (x86_64-unknown-freebsd)	1m 22s
Cross Test (i686-unknown-linux-gnu)	3m 47s
cargo deny	34s
Checking docs	1m 45s
Checking fmt	28s
check_semver	3m 54s
clippy_check	2m 39s
Build wasm32	37s
codespell	8s
Docker Test	2m 13s
Minimal Supported Rust Version	1m 55s
CI Test Suite / Tests (windows-latest, stable, all, x86_64-pc-windows-msvc)	4m 10s
CI Test Suite / Tests (ubuntu-latest, stable, all)	3m 30s
CI Test Suite / Tests (windows-latest, stable, none, x86_64-pc-windows-msvc)	4m 11s
CI Test Suite / Tests (ubuntu-latest, stable, none)	2m 35s
CI Test Suite / Tests (windows-latest, stable, default, x86_64-pc-windows-msvc)	4m 17s
CI Test Suite / Tests (ubuntu-latest, stable, default)	2m 22s
CI Test Suite / Tests (macOS-arm-latest, stable, all)	3m 16s
CI Test Suite / Tests (macOS-arm-latest, stable, none)	3m 18s
CI Test Suite / Tests (macOS-arm-latest, stable, default)	3m 6s
netsim-integration-tests / Netsim	8m 19s
	1h 1m 33s

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