[http-client-csharp] Fix spread model parameter matching to use wire name#10111

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JoshLove-msft wants to merge 4 commits intomicrosoft:mainfrom

JoshLove-msft:fix/spread-model-null-params

Commits on Mar 22, 2026

fix: match spread parameters by wire name instead of C# name

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Commits on Mar 23, 2026

fix: resolve CS8602/CS0165 nullable warnings in spread parameter matching

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regen: update test project baselines after spread fix

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fix: fall back to name-based matching when wire name unavailable

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