Close bucket store for users with no blocks synced #8088

Job	Run time
test	17m 50s
build	4m 21s
lint	15m 37s
integration-configs-db	2m 2s
integration (requires_docker)	5m 4s
integration (integration_alertmanager)	4m 0s
integration (integration_backward_compatibility)	11m 33s
integration (integration_memberlist)	7m 25s
integration (integration_querier)	12m 35s
integration (integration_ruler)	3m 48s
integration (integration_query_fuzz)	1m 44s
deploy	0s
deploy_website	0s
	1h 25m 59s

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