Codex/add abstention as session outcome in .net tests#252

SemeAIPletinnya wants to merge 6 commits intogithub:maingithub/copilot-sdk:mainfrom

SemeAIPletinnya:codex/add-abstention-as-session-outcome-in-.net-testsSemeAIPletinnya/copilot-por-sdk:codex/add-abstention-as-session-outcome-in-.net-testsCopy head branch name to clipboard