ruler: add drop labels functionality #11202

Job	Run time
lint	4m 54s
build	4m 44s
CodeQL	7m 0s
test	16m 31s
test-no-race	8m 11s
integration-configs-db	2m 50s
integration (requires_docker)	7m 12s
integration (integration_alertmanager)	4m 14s
integration (integration_backward_compatibility)	10m 24s
integration (integration_memberlist)	7m 41s
integration (integration_querier)	15m 42s
integration (integration_ruler)	5m 49s
integration (integration_query_fuzz)	5m 6s
deploy_website	0s
deploy	0s
	1h 40m 18s

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