Rust

Return a more specific http status code on conflict. #50224

Job	Run time
clippy-lint	6m 14s
check-style	23s
check-features	13m 15s
build-docs	8m 39s
check-omicron-deployment (macos-14)	24m 40s
check-omicron-deployment (ubuntu-22.04)	4m 40s
	57m 51s

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