allow compactor to use bucket index when sync metas #7997

Job	Run time
build	3m 43s
lint	16m 42s
test	18m 0s
integration-configs-db	2m 1s
integration (requires_docker)	6m 5s
integration (integration_alertmanager)	5m 29s
integration (integration_backward_compatibility)	9m 14s
integration (integration_memberlist)	9m 26s
integration (integration_querier)	12m 53s
integration (integration_ruler)	5m 24s
integration (integration_query_fuzz)	2m 51s
deploy_website	0s
deploy	0s
	1h 31m 48s

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