Partitioning compaction for Cortex #7755

Job	Run time
lint	6m 24s
test	21m 48s
build	6m 12s
integration-configs-db	3m 5s
integration (requires_docker)	6m 17s
integration (integration_alertmanager)	5m 17s
integration (integration_backward_compatibility)	10m 12s
integration (integration_memberlist)	9m 0s
integration (integration_querier)	16m 24s
integration (integration_ruler)	4m 40s
integration (integration_query_fuzz)	2m 51s
deploy_website	0s
deploy	0s
	1h 32m 10s

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