Purge expired postings cache items due inactivity (#6502) #10953

Job	Run time
CodeQL	6m 57s
test	16m 0s
lint	4m 31s
test-no-race	7m 36s
build	4m 7s
integration (requires_docker)	7m 26s
integration (integration_alertmanager)	4m 4s
integration-configs-db	2m 41s
integration (integration_backward_compatibility)	10m 37s
integration (integration_memberlist)	7m 36s
integration (integration_querier)	15m 31s
integration (integration_ruler)	6m 8s
integration (integration_query_fuzz)	4m 45s
deploy_website	53s
deploy	4m 8s
	1h 43m 0s

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