Fix flaky sse-retry conformance test due to CI timing overhead#1336

stephentoub merged 2 commits intomainmodelcontextprotocol/csharp-sdk:mainfrom

copilot/fix-sse-retry-test-failuremodelcontextprotocol/csharp-sdk:copilot/fix-sse-retry-test-failureCopy head branch name to clipboard