Fix race between sled-agent and zone-setup service (#6152) #35106

Job	Run time
check-style	16s
check-features	10m 1s
build-docs	7m 3s
check-omicron-deployment (ubuntu-22.04)	7m 34s
check-omicron-deployment (macos-14)	7m 50s
clippy-lint	8m 36s
	41m 20s

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