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[multistage] support broker segment pruning #18201

@dang-stripe

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@dang-stripe

The default MSE query planner does not support broker-side segment pruning today. The physical optimizer (v2 planner) does support it, but it does not have full feature parity with MSE yet (#15455).

We've noticed if one server becomes unhealthy through a gray failure, it can affect nearly all queries on the tenant since they fan out to all servers. Having pinot automatically route around unhealthy servers is being dealt with in #16253, but ideal the query planner also avoids querying servers unnecessarily.

cc @Jackie-Jiang @yashmayya

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