[WIP] Support remote write v2 #10316

Job	Run time
test	17m 15s
CodeQL	7m 26s
build	3m 59s
lint	4m 16s
integration-configs-db	2m 24s
integration (requires_docker)	6m 44s
integration (integration_alertmanager)	4m 23s
integration (integration_backward_compatibility)	10m 31s
integration (integration_memberlist)	7m 56s
integration (integration_querier)	15m 26s
integration (integration_ruler)	4m 59s
integration (integration_query_fuzz)	3m 50s
integration (integration_remote_write_v2)	2m 10s
deploy_website	0s
deploy	0s
	1h 31m 19s

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