fix(iroh-relay): cleanup client connections in all cases (#3105) #12126

Job	Run time
cargo deny	29s
Checking docs	1m 17s
Android Build Only (aarch64-linux-android)	1m 4s
Android Build Only (armv7-linux-androideabi)	1m 4s
Checking fmt	15s
check_semver	3m 28s
clippy_check	1m 56s
codespell	6s
Cross Build Only (x86_64-unknown-freebsd)	43s
Cross Test (i686-unknown-linux-gnu)	1m 59s
Minimal Supported Rust Version	1m 15s
Build wasm32	36s
netsim-integration-tests / Netsim	5m 25s
CI Test Suite / Tests (ubuntu-latest, stable, all)	2m 43s
CI Test Suite / Tests (windows-latest, stable, all, x86_64-pc-windows-msvc)	2m 9s
CI Test Suite / Tests (ubuntu-latest, stable, none)	2m 32s
CI Test Suite / Tests (windows-latest, stable, none, x86_64-pc-windows-msvc)	2m 6s
CI Test Suite / Tests (ubuntu-latest, stable, default)	2m 4s
CI Test Suite / Tests (windows-latest, stable, default, x86_64-pc-windows-msvc)	2m 7s
CI Test Suite / Tests (macOS-arm-latest, stable, all)	2m 17s
CI Test Suite / Tests (macOS-arm-latest, stable, none)	2m 7s
CI Test Suite / Tests (macOS-arm-latest, stable, default)	2m 8s
	39m 50s

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