feat: OCC and OCS Calendar Import/Export #18603

Job	Run time
changes	10s
integration-sqlite (capabilities_features, 8.1, main)	1m 44s
integration-sqlite (collaboration_features, 8.1, main)	2m 37s
integration-sqlite (comments_features, 8.1, main)	2m 17s
integration-sqlite (dav_features, 8.1, main)	5m 4s
integration-sqlite (features, 8.1, main)	8m 21s
integration-sqlite (federation_features, 8.1, main)	4m 10s
integration-sqlite (--tags ~@large files_features, 8.1, main)	10m 7s
integration-sqlite (filesdrop_features, 8.1, main)	1m 4s
integration-sqlite (file_conversions, 8.1, main)	2m 8s
integration-sqlite (openldap_features, 8.1, main)	2m 5s
integration-sqlite (openldap_numerical_features, 8.1, main)	1m 27s
integration-sqlite (ldap_features, 8.1, main)	1m 51s
integration-sqlite (remoteapi_features, 8.1, main)	1m 34s
integration-sqlite (setup_features, 8.1, main)	1m 24s
integration-sqlite (sharees_features, 8.1, main)	2m 57s
integration-sqlite (sharing_features, 8.1, main)	13m 10s
integration-sqlite (videoverification_features, 8.1, main)	4m 12s
integration-sqlite-summary	5s
	1h 6m 27s

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