[stable31] fix: force lowercase emails #26933

Job	Run time
changes	9s
integration-sqlite (collaboration_features, 8.1, stable31, stable31)	3m 3s
integration-sqlite (dav_features, 8.1, stable31, stable31)	8m 42s
integration-sqlite (features, 8.1, stable31, stable31)	6m 33s
integration-sqlite (comments_features, 8.1, stable31, stable31)	3m 5s
integration-sqlite (federation_features, 8.1, stable31, stable31)	5m 27s
integration-sqlite (file_conversions, 8.1, stable31, stable31)	1m 31s
integration-sqlite (--tags ~@large files_features, 8.1, stable31, stable31)	9m 11s
integration-sqlite (openldap_numerical_features, 8.1, stable31, stable31)	2m 19s
integration-sqlite (remoteapi_features, 8.1, stable31, stable31)	1m 59s
integration-sqlite (setup_features, 8.1, stable31, stable31)	49s
integration-sqlite (capabilities_features, 8.1, stable31, stable31)	2m 20s
integration-sqlite (videoverification_features, 8.1, stable31, stable31)	3m 25s
integration-sqlite (sharees_features, 8.1, stable31, stable31)	4m 20s
integration-sqlite (sharing_features, 8.1, stable31, stable31)	19m 23s
integration-sqlite (filesdrop_features, 8.1, stable31, stable31)	1m 1s
integration-sqlite (ldap_features, 8.1, stable31, stable31)	3m 6s
integration-sqlite (openldap_features, 8.1, stable31, stable31)	2m 40s
integration-sqlite-summary	8s
	1h 19m 11s

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