ruler: add drop labels functionality #11203

Job	Run time
test-no-race	7m 34s
test-no-race	7m 34s
test	16m 10s
test	16m 59s
build	4m 8s
build	4m 8s
lint	4m 27s
lint	4m 27s
CodeQL	6m 44s
CodeQL	6m 44s
integration-configs-db	2m 54s
integration-configs-db	2m 54s
integration (requires_docker)	7m 17s
integration (requires_docker)	7m 17s
integration (integration_alertmanager)	4m 2s
integration (integration_alertmanager)	4m 2s
integration (integration_backward_compatibility)	10m 40s
integration (integration_backward_compatibility)	10m 40s
integration (integration_memberlist)	7m 38s
integration (integration_memberlist)	7m 38s
integration (integration_querier)	15m 43s
integration (integration_querier)	15m 43s
integration (integration_ruler)	5m 54s
integration (integration_ruler)	5m 54s
integration (integration_query_fuzz)	5m 12s
integration (integration_query_fuzz)	5m 12s
deploy_website	0s
deploy_website	0s
deploy	0s
deploy	0s
	3h 17m 35s

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