fix query priority throws 5xx when 4xx #8186

Job	Run time
build	3m 40s
test	18m 7s
lint	18m 47s
integration-configs-db	1m 57s
integration (requires_docker)	5m 7s
integration (integration_alertmanager)	3m 45s
integration (integration_backward_compatibility)	11m 5s
integration (integration_memberlist)	7m 8s
integration (integration_querier)	12m 30s
integration (integration_ruler)	3m 45s
integration (integration_query_fuzz)	1m 44s
deploy_website	0s
deploy	0s
	1h 27m 35s

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