Expose series batch size flag #7827

Job	Run time
build	7m 46s
lint	6m 38s
test	32m 23s
integration-configs-db	3m 2s
integration (requires_docker)	6m 26s
integration (integration_alertmanager)	5m 42s
integration (integration_backward_compatibility)	10m 52s
integration (integration_memberlist)	8m 49s
integration (integration_querier)	15m 1s
integration (integration_ruler)	4m 46s
integration (integration_query_fuzz)	3m 12s
deploy_website	0s
deploy	0s
	1h 44m 37s

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