TUN-8275: Skip write timeout log on "no network activity"

## Summary
To avoid having to verbose logs we need to only log when an
actual issue occurred. Therefore, we will be skipping any error
logging if the write timeout is caused by no network activity
which just means that nothing is being sent through the stream.

quic/safe_stream.go

@@ -11,6 +11,9 @@ import (
 	"github.com/rs/zerolog/log"
 )
 
+// The error that is throw by the writer when there is `no network activity`.
+var idleTimeoutError = quic.IdleTimeoutError{}
+
 type SafeStreamCloser struct {
 	lock         sync.Mutex
 	stream       quic.Stream
@@ -52,7 +55,10 @@ func (s *SafeStreamCloser) handleTimeout(err error) {
 	var netErr net.Error
 	if errors.As(err, &netErr) {
 		if netErr.Timeout() {
-			s.log.Error().Err(netErr).Msg("Closing quic stream due to timeout while writing")
+			// We don't need to log if what cause the timeout was `no network activity`.
+			if !errors.Is(netErr, &idleTimeoutError) {
+				s.log.Error().Err(netErr).Msg("Closing quic stream due to timeout while writing")
+			}
 			s.stream.CancelWrite(0)
 		}
 	}