[WIP] Support remote write v2 #10320

Job	Run time
test	17m 14s
build	4m 7s
lint	4m 20s
CodeQL	6m 33s
integration-configs-db	2m 31s
integration (requires_docker)	7m 2s
integration (integration_alertmanager)	4m 22s
integration (integration_backward_compatibility)	10m 36s
integration (integration_memberlist)	7m 37s
integration (integration_querier)	15m 20s
integration (integration_ruler)	4m 49s
integration (integration_query_fuzz)	3m 52s
integration (integration_remote_write_v2)	2m 17s
deploy_website	0s
deploy	0s
	1h 30m 40s

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