Update Cortex and remove usage of Prometheus fork. #4898
Merged
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This PR finishes update of Prometheus started in PR #4882. There we had to use custom fork of Prometheus with some deprecated packages, because Cortex was still using them. Now that Cortex has been updated by cortexproject/cortex#4560, we can finish Prometheus update in Thanos and remove use of Prometheus fork.
Query-frontend interfaces changed due to cortexproject/cortex#4486. Feature from that PR has not been integrated in this PR.