fix: handle context cancellations in txsim (#2830)

I have seen a few CI tests fail because although the context stops the
process, it isn't correctly parsed causing the program that called the
txsim to think that there was another error and not the context Canceled
or DeadlineExceeded errors

(cherry picked from commit 5dfe777)

test/txsim/run.go

@@ -98,9 +98,16 @@ func Run(
 			log.Info().Err(err).Msg("sequence terminated")
 			continue
 		}
+		if errors.Is(err, context.Canceled) || errors.Is(err, context.DeadlineExceeded) {
+			continue
+		}
 		log.Error().Err(err).Msg("sequence failed")
 		finalErr = err
 	}
 
+	if ctx.Err() != nil {
+		return ctx.Err()
+	}
+
 	return finalErr
 }