fix(iroh): don't hit network for complete blobs&collections #9612

Job	Run time
Android Build Only (aarch64-linux-android)	1m 30s
Android Build Only (armv7-linux-androideabi)	1m 23s
check_semver	3m 33s
Checking docs	1m 37s
Checking fmt	12s
clippy_check	3m 11s
Cross Build Only (x86_64-unknown-freebsd)	1m 13s
Cross Test (i686-unknown-linux-gnu)	3m 31s
Build wasm32	32s
cargo deny	27s
Checking typos	8s
codespell	8s
Docker Test	2m 27s
Minimal Supported Rust Version	1m 26s
Run network simulations/benchmarks	2m 22s
CI Test Suite / Tests (ubuntu-latest, stable, all)	2m 16s
CI Test Suite / Tests (windows-latest, stable, all, x86_64-pc-windows-msvc)	1s
CI Test Suite / Tests (windows-latest, stable, none, x86_64-pc-windows-msvc)	1s
CI Test Suite / Tests (ubuntu-latest, stable, none)	1s
CI Test Suite / Tests (windows-latest, stable, default, x86_64-pc-windows-msvc)	1s
CI Test Suite / Tests (ubuntu-latest, stable, default)	1s
CI Test Suite / Tests (macOS-arm-latest, stable, all)	3m 47s
CI Test Suite / Tests (macOS-arm-latest, stable, none)	1s
CI Test Suite / Tests (macOS-arm-latest, stable, default)	3m 48s
	33m 37s

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