fix(iroh): don't hit network for complete blobs&collections #9600

Job	Run time
Android Build Only (aarch64-linux-android)	1m 21s
cargo deny	27s
Checking fmt	13s
Android Build Only (armv7-linux-androideabi)	1m 22s
Checking docs	1m 8s
check_semver	4m 32s
Checking typos	10s
clippy_check	2m 41s
codespell	4s
Cross Build Only (x86_64-unknown-freebsd)	1m 12s
Cross Test (i686-unknown-linux-gnu)	2m 0s
Docker Test	17m 40s
Minimal Supported Rust Version	1m 54s
Run network simulations/benchmarks	7m 13s
Build wasm32	34s
CI Test Suite / Tests (ubuntu-latest, stable, all)	3m 14s
CI Test Suite / Tests (ubuntu-latest, stable, none)	3m 18s
CI Test Suite / Tests (windows-latest, stable, all, x86_64-pc-windows-msvc)	9m 26s
CI Test Suite / Tests (ubuntu-latest, stable, default)	3m 20s
CI Test Suite / Tests (macOS-arm-latest, stable, all)	5m 20s
CI Test Suite / Tests (windows-latest, stable, none, x86_64-pc-windows-msvc)	8m 53s
CI Test Suite / Tests (macOS-arm-latest, stable, none)	5m 15s
CI Test Suite / Tests (windows-latest, stable, default, x86_64-pc-windows-msvc)	8m 39s
CI Test Suite / Tests (macOS-arm-latest, stable, default)	5m 16s
	1h 35m 12s

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