Add cancellation-safe quote request metrics#4609
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Description
Adds cancellation-safe metrics for the
/quoteendpoint: every request is counted at handler entry (so client-cancelled/dropped requests are included), plus a separate counter for downstream requests to the price-estimation layer — giving an incoming-vs-downstream viewChanges
Adds three counters
gp_v2_api_quote_requests_started{price_quality}: incremented at handler entry, before the first.await, so cancelled requests are still counted.gp_v2_api_quote_requests_finished{price_quality,result}resultsuccess|error|cancelled, via a Drop guard defaulting tocancelled. Invariant: started == sum(finished).gp_v2_api_quote_downstream_requests{kind}kindtrade|native, incremented per fan-out inOrderQuoter::compute_quote_datafor the incoming-vs-downstream ratio.