Add catch for ConnectionAborted in Http3 (#93049)

* Racing between protocol close and abort fix

* Add catching for ConnectionAbort in two places

* Revert change on test

Author: liveans

src/libraries/System.Net.Http/src/System/Net/Http/SocketsHttpHandler/Http3Connection.cs

@@ -388,6 +388,13 @@ private async Task SendSettingsAsync()
 
                 await _clientControl.WriteAsync(_pool.Settings.Http3SettingsFrame, CancellationToken.None).ConfigureAwait(false);
             }
+            catch (QuicException ex) when (ex.QuicError == QuicError.ConnectionAborted)
+            {
+                Debug.Assert(ex.ApplicationErrorCode.HasValue);
+                Http3ErrorCode code = (Http3ErrorCode)ex.ApplicationErrorCode.Value;
+
+                Abort(HttpProtocolException.CreateHttp3ConnectionException(code, SR.net_http_http3_connection_close));
+            }
             catch (Exception ex)
             {
                 Abort(ex);
@@ -577,6 +584,13 @@ private async Task ProcessServerStreamAsync(QuicStream stream)
             {
                 // ignore the exception, we have already closed the connection
             }
+            catch (QuicException ex) when (ex.QuicError == QuicError.ConnectionAborted)
+            {
+                Debug.Assert(ex.ApplicationErrorCode.HasValue);
+                Http3ErrorCode code = (Http3ErrorCode)ex.ApplicationErrorCode.Value;
+
+                Abort(HttpProtocolException.CreateHttp3ConnectionException(code, SR.net_http_http3_connection_close));
+            }
             catch (Exception ex)
             {
                 Abort(ex);