perf(systemtags): Add index for systemtags_object_mappings.objectid #8220

Job	Run time
changes	7s
integration-sqlite (capabilities_features, 8.2, main)	5m 28s
integration-sqlite (collaboration_features, 8.2, main)	1m 48s
integration-sqlite (comments_features, 8.2, main)	1m 50s
integration-sqlite (dav_features, 8.2, main)	15m 17s
integration-sqlite (features, 8.2, main)	16m 51s
integration-sqlite (federation_features, 8.2, main)	10m 48s
integration-sqlite (--tags ~@large files_features, 8.2, main)	19m 59s
integration-sqlite (filesdrop_features, 8.2, main)	59s
integration-sqlite (openldap_features, 8.2, main)	7m 39s
integration-sqlite (openldap_numerical_features, 8.2, main)	6m 35s
integration-sqlite (ldap_features, 8.2, main)	7m 28s
integration-sqlite (remoteapi_features, 8.2, main)	6m 50s
integration-sqlite (setup_features, 8.2, main)	6m 3s
integration-sqlite (sharees_features, 8.2, main)	9m 17s
integration-sqlite (sharing_features, 8.2, main)	26m 21s
integration-sqlite (videoverification_features, 8.2, main)	10m 44s
integration-sqlite-summary	5s
	2h 34m 9s

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