test(quic): cover the peer being told that a ClientQUIC closed

ShouldTellPeerOfCloseQUIC: twenty clients connect to a listener whose
idle timeout is 20 s and are destroyed in turn; for each, the server
side's RecieveDatagramSync, which throws once the peer has closed the
connection, must return within 2 s. Before the fix the first one never
did, since ~ClientQUIC closed its handle before msquic had sent the
CONNECTION_CLOSE frame; the loop stops at the first miss, as every
later connection would wait out its 2 s too.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

project.cpp

@@ -207,6 +207,7 @@ extern "C" Configuration CrafterBuildProject(std::span<const std::string_view> a
             cfg.AddTest("ShouldReportListenerPortQUIC").Dependencies({ &cfg });
             cfg.AddTest("ShouldShareSelfSignedCertificateQUIC").Dependencies({ &cfg });
             cfg.AddTest("ShouldSurviveConnectionChurn").Dependencies({ &cfg });
+            cfg.AddTest("ShouldTellPeerOfCloseQUIC").Dependencies({ &cfg });
         } else {
             // Only a --no-quic build can show that msquic stayed out.
             cfg.AddTest("ShouldBuildWithoutQUIC").Dependencies({ &cfg });