Partitioning compaction for Cortex #7788

Job	Run time
test	30m 41s
build	5m 55s
lint	3m 44s
integration-configs-db	2m 57s
integration (requires_docker)	6m 7s
integration (integration_alertmanager)	5m 14s
integration (integration_backward_compatibility)	10m 10s
integration (integration_memberlist)	9m 21s
integration (integration_querier)	16m 14s
integration (integration_ruler)	4m 32s
integration (integration_query_fuzz)	2m 47s
deploy_website	0s
deploy	0s
	1h 37m 42s

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