feat(iroh): improve shutdown interactions #11531

Job	Run time
Cross Build Only (x86_64-unknown-freebsd)	46s
Build wasm32	40s
Android Build Only (aarch64-linux-android)	1m 7s
Android Build Only (armv7-linux-androideabi)	1m 7s
Checking docs	1m 12s
Checking fmt	22s
check_semver	4m 15s
clippy_check	2m 12s
Cross Test (i686-unknown-linux-gnu)	2m 16s
cargo deny	27s
Minimal Supported Rust Version	1m 2s
codespell	5s
CI Test Suite / Tests (ubuntu-latest, stable, all)	2m 2s
CI Test Suite / Tests (ubuntu-latest, stable, none)	1m 50s
CI Test Suite / Tests (ubuntu-latest, stable, default)	1m 51s
CI Test Suite / Tests (macOS-arm-latest, stable, all)	2m 17s
CI Test Suite / Tests (macOS-arm-latest, stable, none)	1m 59s
CI Test Suite / Tests (windows-latest, stable, all, x86_64-pc-windows-msvc)	2m 20s
CI Test Suite / Tests (macOS-arm-latest, stable, default)	2m 4s
CI Test Suite / Tests (windows-latest, stable, none, x86_64-pc-windows-msvc)	2m 12s
CI Test Suite / Tests (windows-latest, stable, default, x86_64-pc-windows-msvc)	2m 14s
netsim-integration-tests / Netsim	6m 0s
	40m 20s

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