Rust

`IncompleteNetworkInterface`: allow user-specified explicit `slot` #27981

Job	Run time
build-docs	10m 32s
check-style	17s
clippy-lint	9m 32s
check-omicron-deployment (ubuntu-22.04)	9m 8s
check-omicron-deployment (macos-14)	8m 44s
	38m 13s

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