enh: Fix display default expire date, add tests & tiny refactors #17851

Job	Run time
changes	5s
integration-sqlite (capabilities_features, 8.1, main)	2m 41s
integration-sqlite (collaboration_features, 8.1, main)	4m 37s
integration-sqlite (comments_features, 8.1, main)	3m 9s
integration-sqlite (dav_features, 8.1, main)	5m 17s
integration-sqlite (features, 8.1, main)	8m 55s
integration-sqlite (federation_features, 8.1, main)	5m 35s
integration-sqlite (--tags ~@large files_features, 8.1, main)	11m 56s
integration-sqlite (filesdrop_features, 8.1, main)	2m 13s
integration-sqlite (file_conversions, 8.1, main)	2m 56s
integration-sqlite (openldap_features, 8.1, main)	2m 3s
integration-sqlite (openldap_numerical_features, 8.1, main)	2m 36s
integration-sqlite (ldap_features, 8.1, main)	2m 20s
integration-sqlite (remoteapi_features, 8.1, main)	1m 53s
integration-sqlite (setup_features, 8.1, main)	1m 29s
integration-sqlite (sharees_features, 8.1, main)	3m 36s
integration-sqlite (sharing_features, 8.1, main)	17m 27s
integration-sqlite (videoverification_features, 8.1, main)	4m 48s
integration-sqlite-summary	5s
	1h 23m 41s

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