refactor(iroh-net)!: remove async channel #9857

Job	Run time
Checking docs	1m 30s
Android Build Only (aarch64-linux-android)	1m 18s
Android Build Only (armv7-linux-androideabi)	1m 21s
cargo deny	35s
Checking fmt	17s
check_semver	5m 55s
Checking typos	11s
clippy_check	2m 31s
codespell	12s
Cross Build Only (x86_64-unknown-freebsd)	1m 9s
Cross Test (i686-unknown-linux-gnu)	3m 33s
Docker Test	8m 3s
Minimal Supported Rust Version	1m 53s
Run network simulations/benchmarks	7m 48s
Build wasm32	33s
CI Test Suite / Tests (windows-latest, stable, all, x86_64-pc-windows-msvc)	3m 39s
CI Test Suite / Tests (ubuntu-latest, stable, all)	3m 22s
CI Test Suite / Tests (windows-latest, stable, none, x86_64-pc-windows-msvc)	3m 36s
CI Test Suite / Tests (ubuntu-latest, stable, none)	3m 33s
CI Test Suite / Tests (windows-latest, stable, default, x86_64-pc-windows-msvc)	3m 41s
CI Test Suite / Tests (ubuntu-latest, stable, default)	2m 47s
CI Test Suite / Tests (macOS-arm-latest, stable, all)	4m 18s
CI Test Suite / Tests (macOS-arm-latest, stable, none)	3m 19s
CI Test Suite / Tests (macOS-arm-latest, stable, default)	3m 50s
	1h 8m 54s

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