Minor changes to UKI install flow #4851

Job	Run time
cargo-deny	25s
validate	25m 1s
Test install	36m 15s
docs	3m 9s
test-integration (centos-9)	1h 15m 0s
test-integration-cfs (centos-10, composefs-sealeduki-sdboot)	37m 42s
test-integration (fedora-43)	1h 18m 49s
test-integration (centos-10)	1h 5m 56s
test-integration (fedora-42)	1h 24m 15s
required-checks	4s
	6h 46m 36s

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