feat: fully finalize unicorn flavor #991

Job	Run time
check-flavor	5s
validate (install, unicorn) / run	16m 45s
validate (install, upstream) / run	17m 16s
validate (install, registry1) / run	16m 48s
validate (upgrade, registry1) / run	22m 50s
validate (upgrade, unicorn) / run	26m 21s
validate (upgrade, upstream) / run	24m 17s
	2h 4m 22s

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