Don't buffer doctor logger (#19982)

- We don't need to buffer the logger with a thousand capacity. It's not
a high-throughput logger, this also caused issue whereby the logger
can't keep up with repeated messages being send(somehow they are lost in
the queue?).
- Resolves #19969

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

cmd/doctor.go

@@ -203,7 +203,7 @@ func runDoctor(ctx *cli.Context) error {
 
 	// Now we can set up our own logger to return information about what the doctor is doing
 	if err := log.NewNamedLogger("doctorouter",
-		1000,
+		0,
 		"console",
 		"console",
 		fmt.Sprintf(`{"level":"INFO","stacktracelevel":"NONE","colorize":%t,"flags":-1}`, colorize)); err != nil {