refactor(iroh): Replace `timer` module with `AbortOnDropHandle` and s… #12261

Job	Run time
cargo deny	26s
Android Build Only (aarch64-linux-android)	1m 11s
Android Build Only (armv7-linux-androideabi)	1m 5s
Checking docs	1m 4s
Checking fmt	22s
check_semver	2m 45s
clippy_check	1m 32s
codespell	6s
Cross Build Only (x86_64-unknown-freebsd)	44s
Cross Test (i686-unknown-linux-gnu)	2m 0s
Minimal Supported Rust Version	55s
Build wasm32	32s
CI Test Suite / Tests (ubuntu-latest, stable, all)	2m 31s
netsim-integration-tests / Netsim	6m 14s
CI Test Suite / Tests (ubuntu-latest, stable, none)	2m 23s
CI Test Suite / Tests (ubuntu-latest, stable, default)	2m 11s
CI Test Suite / Tests (macOS-arm-latest, stable, all)	2m 22s
CI Test Suite / Tests (windows-latest, stable, all, x86_64-pc-windows-msvc)	2m 13s
CI Test Suite / Tests (macOS-arm-latest, stable, none)	2m 8s
CI Test Suite / Tests (windows-latest, stable, none, x86_64-pc-windows-msvc)	2m 24s
CI Test Suite / Tests (macOS-arm-latest, stable, default)	2m 9s
CI Test Suite / Tests (windows-latest, stable, default, x86_64-pc-windows-msvc)	2m 15s
	39m 32s

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