feat(comments): Allow mentions of federated users, groups and teams #1482

Job	Run time
changes	9s
integration-sqlite (capabilities_features, 8.2, main)	5m 2s
integration-sqlite (collaboration_features, 8.2, main)	1m 49s
integration-sqlite (comments_features, 8.2, main)	5m 56s
integration-sqlite (dav_features, 8.2, main)	4m 32s
integration-sqlite (features, 8.2, main)	14m 15s
integration-sqlite (federation_features, 8.2, main)	2m 33s
integration-sqlite (--tags ~@large files_features, 8.2, main)	18m 23s
integration-sqlite (filesdrop_features, 8.2, main)	47s
integration-sqlite (openldap_features, 8.2, main)	1m 13s
integration-sqlite (openldap_numerical_features, 8.2, main)	1m 12s
integration-sqlite (ldap_features, 8.2, main)	1m 3s
integration-sqlite (remoteapi_features, 8.2, main)	4m 52s
integration-sqlite (setup_features, 8.2, main)	4m 40s
integration-sqlite (sharees_features, 8.2, main)	2m 36s
integration-sqlite (sharing_features, 8.2, main)	24m 38s
integration-sqlite (videoverification_features, 8.2, main)	3m 19s
integration-sqlite-summary	8s
	1h 37m 7s

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