Rust

go back to defaulting to `never` #37526

Job	Run time
build-docs	8m 34s
check-style	17s
check-features	10m 17s
check-omicron-deployment (ubuntu-22.04)	8m 32s
check-omicron-deployment (macos-14)	9m 36s
clippy-lint	9m 49s
	47m 5s

Provide feedback