Fix cleaner not discovering deleted users from global dir (#5691) #8174

Job	Run time
build	3m 41s
lint	16m 27s
test	18m 9s
integration-configs-db	2m 2s
integration (requires_docker)	5m 4s
integration (integration_alertmanager)	3m 45s
integration (integration_backward_compatibility)	11m 2s
integration (integration_memberlist)	7m 17s
integration (integration_querier)	12m 54s
integration (integration_ruler)	3m 41s
integration (integration_query_fuzz)	1m 57s
deploy	2m 23s
deploy_website	1m 22s
	1h 29m 44s

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