syncer: some log are confusing #8717
Description
Enhancement Task
[2024/09/25 18:39:35.430 +00:00] [INFO] [client.go:126] ["region syncer start load region"]",
[2024/09/25 18:39:35.430 +00:00] [INFO] [client.go:129] ["region syncer finished load region"] [time-cost=545ns]",
[2024/09/25 18:39:35.448 +00:00] [ERROR] [client.go:174] ["region sync with leader meet error"] [error="[PD:grpc:ErrGRPCRecv]rpc error: code = Unavailable desc = server not started: rpc error: code = Unavailable desc = server not started"]