Add default partition when no matching labelset liimits #10741

Job	Run time
build	4m 8s
lint	4m 27s
test	15m 55s
CodeQL	7m 14s
test-no-race	7m 20s
integration-configs-db	2m 42s
integration (requires_docker)	7m 16s
integration (integration_alertmanager)	4m 18s
integration (integration_backward_compatibility)	11m 10s
integration (integration_memberlist)	7m 43s
integration (integration_querier)	15m 13s
integration (integration_ruler)	5m 56s
integration (integration_query_fuzz)	5m 8s
deploy_website	0s
deploy	0s
	1h 38m 30s

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