Distributed Engine: have some partial response strategy

[MichaHoffmann]

Partial response strategy is something that is thanos specific right now and abstracted into the Select() call. Distributed engine changes that since it does the remote calls itself. We should think how we want to handle partial responses during distributed query execution.

[fpetkovski]

Perhaps this can be solved directly into the remote engine implementation where we convert errors to warns?

[MichaHoffmann]

After quite a while - I agree this should be handled on the thanos side.