MET-6218 Replace unknown with legacy depublication reason (#700) #1218

Job	Run time
ci / build	5m 48s
deploy-artifacts / deploy_libraries	2m 17s
docker-build_metis-authentication / docker-build-push	51s
docker-build_metis-dereference / docker-build-push	53s
docker-build_metis-repository / docker-build-push	37s
	10m 26s

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