Stabilize InvokeWithCancellationAsync_TimeoutAndDisconnectDuringSend_ThrowsTimeoutException test

Author: AArnott

src/StreamJsonRpc/JsonRpc.cs

@@ -2341,6 +2341,10 @@ private JsonRpcError CreateCancellationResponse(JsonRpcRequest request)
         {
             throw new TimeoutException(Resources.FormatOutboundInvocationTimedOut(nameof(this.OutboundRequestTimeout)), ex);
         }
+        catch (ConnectionLostException ex) when (timeoutCancellationSource?.IsCancellationRequested is true && !cancellationToken.IsCancellationRequested)
+        {
+            throw new TimeoutException(Resources.FormatOutboundInvocationTimedOut(nameof(this.OutboundRequestTimeout)), ex);
+        }
         catch (OperationCanceledException ex) when (this.DisconnectedToken.IsCancellationRequested && !effectiveOutboundCancellationToken.IsCancellationRequested)
         {
             throw new ConnectionLostException(Resources.ConnectionDropped, ex);