[WIP] Support remote write v2 #10248

Job	Run time
build	4m 7s
lint	2m 44s
CodeQL	7m 33s
test	17m 11s
integration-configs-db	2m 27s
integration (requires_docker)	6m 40s
integration (integration_alertmanager)	4m 26s
integration (integration_backward_compatibility)	10m 10s
integration (integration_memberlist)	7m 47s
integration (integration_querier)	15m 18s
integration (integration_ruler)	5m 13s
integration (integration_query_fuzz)	2m 2s
integration (integration_remote_write_v2)	2m 14s
deploy_website	0s
deploy	0s
	1h 27m 52s

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