feat(iroh): improve shutdown interactions #11530

Job	Run time
Cross Build Only (x86_64-unknown-freebsd)	46s
Android Build Only (aarch64-linux-android)	1m 5s
cargo deny	29s
Android Build Only (armv7-linux-androideabi)	1m 5s
Checking docs	1m 13s
Checking fmt	23s
check_semver	4m 0s
clippy_check	1m 35s
codespell	4s
Cross Test (i686-unknown-linux-gnu)	2m 11s
Minimal Supported Rust Version	1m 3s
Build wasm32	43s
CI Test Suite / Tests (ubuntu-latest, stable, all)	2m 3s
CI Test Suite / Tests (ubuntu-latest, stable, none)	1m 49s
CI Test Suite / Tests (ubuntu-latest, stable, default)	1m 48s
CI Test Suite / Tests (windows-latest, stable, all, x86_64-pc-windows-msvc)	2m 27s
CI Test Suite / Tests (macOS-arm-latest, stable, all)	2m 14s
CI Test Suite / Tests (windows-latest, stable, none, x86_64-pc-windows-msvc)	2m 15s
CI Test Suite / Tests (macOS-arm-latest, stable, none)	2m 4s
CI Test Suite / Tests (windows-latest, stable, default, x86_64-pc-windows-msvc)	2m 25s
CI Test Suite / Tests (macOS-arm-latest, stable, default)	2m 6s
netsim-integration-tests / Netsim	6m 10s
	39m 58s

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