[stable31] fix(systemtags): case-insensitive search & prevent duplicates #26861

Job	Run time
changes	7s
integration-sqlite (collaboration_features, 8.1, stable31, stable31)	2m 44s
integration-sqlite (federation_features, 8.1, stable31, stable31)	4m 40s
integration-sqlite (capabilities_features, 8.1, stable31, stable31)	2m 13s
integration-sqlite (features, 8.1, stable31, stable31)	8m 10s
integration-sqlite (openldap_features, 8.1, stable31, stable31)	1m 56s
integration-sqlite (--tags ~@large files_features, 8.1, stable31, stable31)	12m 21s
integration-sqlite (dav_features, 8.1, stable31, stable31)	5m 46s
integration-sqlite (filesdrop_features, 8.1, stable31, stable31)	2m 0s
integration-sqlite (remoteapi_features, 8.1, stable31, stable31)	1m 35s
integration-sqlite (file_conversions, 8.1, stable31, stable31)	1m 57s
integration-sqlite (videoverification_features, 8.1, stable31, stable31)	4m 48s
integration-sqlite (sharing_features, 8.1, stable31, stable31)	15m 40s
integration-sqlite (setup_features, 8.1, stable31, stable31)	1m 50s
integration-sqlite (sharees_features, 8.1, stable31, stable31)	3m 29s
integration-sqlite (ldap_features, 8.1, stable31, stable31)	2m 6s
integration-sqlite (openldap_numerical_features, 8.1, stable31, stable31)	1m 58s
integration-sqlite (comments_features, 8.1, stable31, stable31)	2m 19s
integration-sqlite-summary	5s
	1h 15m 44s

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