feat: add IUserFolder similar to IRootFolder #36596

Job	Run time
changes	7s
integration-sqlite (dav_features, 8.4, main, master)	10m 55s
integration-sqlite (file_conversions, 8.4, main, master)	2m 43s
integration-sqlite (filesdrop_features, 8.4, main, master)	2m 30s
integration-sqlite (--tags ~@large files_features, 8.4, main, master)	18m 30s
integration-sqlite (remoteapi_features, 8.4, main, master)	1m 58s
integration-sqlite (comments_features, 8.4, main, master)	3m 2s
integration-sqlite (setup_features, 8.4, main, master)	1m 19s
integration-sqlite (theming_features, 8.4, main, master)	2m 48s
integration-sqlite (sharees_features, 8.4, main, master)	8m 27s
integration-sqlite (capabilities_features, 8.4, main, master)	2m 55s
integration-sqlite (openldap_features, 8.4, main, master)	2m 17s
integration-sqlite (federation_features, 8.4, main, master)	5m 51s
integration-sqlite (files_reminders, 8.4, main, master)	1m 51s
integration-sqlite (collaboration_features, 8.4, main, master)	3m 53s
integration-sqlite (ldap_features, 8.4, main, master)	2m 51s
integration-sqlite (routing_features, 8.4, main, master)	2m 16s
integration-sqlite (openldap_numerical_features, 8.4, main, master)	1m 59s
integration-sqlite (videoverification_features, 8.4, main, master)	6m 26s
integration-sqlite (sharing_features, 8.4, main, master)	22m 52s
integration-sqlite (features, 8.4, main, master)	11m 55s
integration-sqlite-summary	6s
	1h 57m 31s

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