Fix cleaner not discovering deleted users from global dir #8170

Job	Run time
lint	16m 55s
build	3m 49s
test	17m 53s
integration-configs-db	2m 10s
integration (requires_docker)	5m 7s
integration (integration_alertmanager)	3m 52s
integration (integration_backward_compatibility)	11m 9s
integration (integration_memberlist)	7m 18s
integration (integration_querier)	13m 15s
integration (integration_ruler)	3m 33s
integration (integration_query_fuzz)	2m 1s
deploy	0s
deploy_website	0s
	1h 27m 2s

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