fix(AppDiscoverFetcher): Do not remove entries as expired that have no expiry date #2641

Job	Run time
changes	16s
integration-sqlite (capabilities_features, 8.2, main)	4m 58s
integration-sqlite (collaboration_features, 8.2, main)	5m 8s
integration-sqlite (comments_features, 8.2, main)	5m 24s
integration-sqlite (dav_features, 8.2, main)	8m 54s
integration-sqlite (features, 8.2, main)	10m 19s
integration-sqlite (federation_features, 8.2, main)	6m 42s
integration-sqlite (--tags ~@large files_features, 8.2, main)	12m 6s
integration-sqlite (filesdrop_features, 8.2, main)	4m 1s
integration-sqlite (openldap_features, 8.2, main)	4m 53s
integration-sqlite (openldap_numerical_features, 8.2, main)	4m 13s
integration-sqlite (ldap_features, 8.2, main)	4m 38s
integration-sqlite (remoteapi_features, 8.2, main)	4m 56s
integration-sqlite (setup_features, 8.2, main)	4m 0s
integration-sqlite (sharees_features, 8.2, main)	6m 39s
integration-sqlite (sharing_features, 8.2, main)	19m 42s
integration-sqlite (videoverification_features, 8.2, main)	7m 21s
integration-sqlite-summary	6s
	1h 54m 16s

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