Improve error detail when saving an incorrect LDAP config #18664

Job	Run time
changes	6s
integration-sqlite (capabilities_features, 8.1, main)	2m 2s
integration-sqlite (collaboration_features, 8.1, main)	3m 33s
integration-sqlite (comments_features, 8.1, main)	2m 54s
integration-sqlite (dav_features, 8.1, main)	9m 0s
integration-sqlite (features, 8.1, main)	11m 15s
integration-sqlite (federation_features, 8.1, main)	3m 36s
integration-sqlite (--tags ~@large files_features, 8.1, main)	10m 5s
integration-sqlite (filesdrop_features, 8.1, main)	2m 10s
integration-sqlite (file_conversions, 8.1, main)	2m 34s
integration-sqlite (openldap_features, 8.1, main)	2m 9s
integration-sqlite (openldap_numerical_features, 8.1, main)	2m 10s
integration-sqlite (ldap_features, 8.1, main)	2m 22s
integration-sqlite (remoteapi_features, 8.1, main)	2m 15s
integration-sqlite (setup_features, 8.1, main)	1m 40s
integration-sqlite (sharees_features, 8.1, main)	4m 48s
integration-sqlite (sharing_features, 8.1, main)	20m 27s
integration-sqlite (videoverification_features, 8.1, main)	4m 15s
integration-sqlite-summary	4s
	1h 27m 25s

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