Fix race on the string interning #10658

Job	Run time
lint	2m 41s
CodeQL	6m 59s
test	43m 16s
build	4m 15s
integration-configs-db	2m 51s
integration (requires_docker)	7m 24s
integration (integration_alertmanager)	4m 21s
integration (integration_backward_compatibility)	10m 36s
integration (integration_memberlist)	7m 29s
integration (integration_querier)	15m 5s
integration (integration_ruler)	5m 37s
integration (integration_query_fuzz)	4m 50s
deploy_website	0s
deploy	0s
	1h 55m 24s

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