Retry a few tests (#44235)

- looks like general flakiness of a couple of test classes

Co-authored-by: Doug Bunting <6431421+dougbu@users.noreply.github.com>

Author: github-actions[bot]

eng/test-configuration.json

@@ -7,6 +7,9 @@
     {"testName": {"contains": "MaxRequestBufferSizeTests.LargeUpload" }},
     {"testName": {"contains": "ReaderThrowsResetExceptionOnInvalidBody" }},
     {"testName": {"contains": "AttributeRouting_RouteNameTokenReplace_Reachable" }},
+    {"testName": {"contains": "Http3RequestTests"}},
+    {"testName": {"contains": "Http3TlsTests"}},
+    {"testName": {"contains": "StreamPool_StreamAbortedOnClientAndServer_NotPooled"}},
     {"testName": {"contains": "ServerCertificateSelector_Invoked"}},
     {"testName": {"contains": "TraceIdentifierIsUnique"}},
     {"testName": {"contains": "LocationChangingHandlers_CannotCancelTheNavigationAsynchronously_UntilReturning"}},