refactor(iroh): remove genawaiter usage from dht discovery #11838

Job	Run time
Android Build Only (aarch64-linux-android)	1m 3s
cargo deny	29s
Checking fmt	38s
Checking docs	1m 33s
Android Build Only (armv7-linux-androideabi)	1m 5s
check_semver	4m 13s
clippy_check	2m 36s
codespell	4s
Cross Build Only (x86_64-unknown-freebsd)	44s
Cross Test (i686-unknown-linux-gnu)	1m 52s
Minimal Supported Rust Version	1m 48s
Build wasm32	29s
netsim-integration-tests / Netsim	5m 20s
CI Test Suite / Tests (ubuntu-latest, stable, all)	2m 49s
CI Test Suite / Tests (ubuntu-latest, stable, none)	2m 51s
CI Test Suite / Tests (ubuntu-latest, stable, default)	2m 50s
CI Test Suite / Tests (windows-latest, stable, all, x86_64-pc-windows-msvc)	2m 19s
CI Test Suite / Tests (macOS-arm-latest, stable, all)	2m 54s
CI Test Suite / Tests (windows-latest, stable, none, x86_64-pc-windows-msvc)	2m 8s
CI Test Suite / Tests (macOS-arm-latest, stable, none)	2m 17s
CI Test Suite / Tests (windows-latest, stable, default, x86_64-pc-windows-msvc)	2m 10s
CI Test Suite / Tests (macOS-arm-latest, stable, default)	2m 38s
	44m 50s

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