Partitioning compaction for Cortex #7790

Job	Run time
lint	6m 52s
build	7m 58s
test	28m 35s
integration (requires_docker)	6m 33s
integration-configs-db	2m 56s
integration (integration_alertmanager)	4m 54s
integration (integration_backward_compatibility)	10m 33s
integration (integration_memberlist)	9m 44s
integration (integration_querier)	16m 43s
integration (integration_ruler)	4m 45s
integration (integration_query_fuzz)	2m 55s
deploy_website	0s
deploy	0s
	1h 42m 28s

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