Partitioning compaction for Cortex #7791

Job	Run time
test	33m 1s
build	5m 57s
lint	6m 52s
integration-configs-db	3m 6s
integration (requires_docker)	6m 8s
integration (integration_alertmanager)	5m 23s
integration (integration_backward_compatibility)	10m 13s
integration (integration_memberlist)	9m 22s
integration (integration_querier)	14m 16s
integration (integration_ruler)	4m 40s
integration (integration_query_fuzz)	2m 42s
deploy	0s
deploy_website	0s
	1h 41m 40s

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