Cleanup dangling request queue metrics #10742

Job	Run time
lint	4m 17s
CodeQL	7m 1s
test	15m 57s
build	4m 3s
test-no-race	7m 27s
integration-configs-db	2m 56s
integration (requires_docker)	7m 12s
integration (integration_alertmanager)	4m 27s
integration (integration_backward_compatibility)	10m 20s
integration (integration_memberlist)	7m 43s
integration (integration_querier)	15m 7s
integration (integration_ruler)	5m 46s
integration (integration_query_fuzz)	5m 0s
deploy_website	0s
deploy	0s
	1h 37m 16s

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