Expose series batch size flag #7828

Job	Run time
build	5m 48s
test	28m 9s
lint	6m 30s
integration-configs-db	4m 28s
integration (requires_docker)	6m 38s
integration (integration_alertmanager)	4m 45s
integration (integration_backward_compatibility)	11m 19s
integration (integration_memberlist)	7m 53s
integration (integration_querier)	14m 3s
integration (integration_ruler)	4m 35s
integration (integration_query_fuzz)	3m 36s
deploy_website	0s
deploy	0s
	1h 37m 44s

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