Rust

[nexus] Turn `instance.boot_on_fault` into an enum #37443

Job	Run time
build-docs	8m 10s
check-features	10m 6s
check-omicron-deployment (ubuntu-22.04)	8m 32s
check-style	19s
check-omicron-deployment (macos-14)	9m 27s
clippy-lint	9m 47s
	46m 21s

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