fix(Storage): Fix getDirectoryContent() return type #12114

Job	Run time
changes	6s
integration-sqlite (capabilities_features, 8.1, main)	3m 2s
integration-sqlite (collaboration_features, 8.1, main)	4m 18s
integration-sqlite (comments_features, 8.1, main)	3m 26s
integration-sqlite (dav_features, 8.1, main)	7m 1s
integration-sqlite (features, 8.1, main)	7m 28s
integration-sqlite (federation_features, 8.1, main)	5m 16s
integration-sqlite (--tags ~@large files_features, 8.1, main)	10m 50s
integration-sqlite (filesdrop_features, 8.1, main)	2m 7s
integration-sqlite (openldap_features, 8.1, main)	3m 6s
integration-sqlite (openldap_numerical_features, 8.1, main)	2m 13s
integration-sqlite (ldap_features, 8.1, main)	3m 6s
integration-sqlite (remoteapi_features, 8.1, main)	2m 45s
integration-sqlite (setup_features, 8.1, main)	1m 56s
integration-sqlite (sharees_features, 8.1, main)	4m 24s
integration-sqlite (sharing_features, 8.1, main)	13m 39s
integration-sqlite (videoverification_features, 8.1, main)	6m 26s
integration-sqlite-summary	4s
	1h 21m 13s

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