Fix cleaner not discovering deleted users from global dir #8158

Job	Run time
lint	25m 22s
build	4m 2s
test	17m 43s
integration-configs-db	1m 53s
integration (requires_docker)	5m 7s
integration (integration_alertmanager)	3m 47s
integration (integration_backward_compatibility)	11m 47s
integration (integration_memberlist)	7m 10s
integration (integration_querier)	12m 42s
integration (integration_ruler)	3m 33s
integration (integration_query_fuzz)	1m 51s
deploy_website	0s
deploy	0s
	1h 34m 57s

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