GODRIVER-3163 [master] Preserve original cancellation/timeout errors. (…

…#1627)

Co-authored-by: Felipe Gasper <FGasper@users.noreply.github.com>

x/mongo/driver/topology/connection.go

@@ -318,7 +318,7 @@ func transformNetworkError(ctx context.Context, originalError error, contextDead
 
  // If there was an error and the context was cancelled, we assume it happened due to the cancellation.
  if errors.Is(ctx.Err(), context.Canceled) {
- return context.Canceled
+ return ctx.Err()
  }
 
  // If there was a timeout error and the context deadline was used, we convert the error into
@@ -327,7 +327,7 @@ func transformNetworkError(ctx context.Context, originalError error, contextDead
  return originalError
  }
  if netErr, ok := originalError.(net.Error); ok && netErr.Timeout() {
- return context.DeadlineExceeded
+ return fmt.Errorf("%w: %s", context.DeadlineExceeded, originalError.Error())
  }
 
  return originalError