Fix sub-command log level (#25537) (#25553)

Backport #25537

More fix for #24981

* #24981

Close #22361, #25552

* #22361
* #25552

There were many patches for Gitea's sub-commands to satisfy the facts:

* Some sub-commands shouldn't output any log, otherwise the git protocol
would be broken
* Sometimes the users want to see "verbose" or "quiet" outputs

That's a longstanding problem, and very fragile. This PR is only a quick
patch for the problem.

In the future, the sub-command system should be refactored to a clear
solution.

----

Other changes:

* Use `ReplaceAllWriters` to replace
`RemoveAllWriters().AddWriters(writer)`, then it's an atomic operation.
* Remove unnecessary `syncLevelInternal` calls, because
`AddWriters/addWritersInternal` already calls it.

modules/log/logger_global.go

@@ -79,5 +79,5 @@ func SetConsoleLogger(loggerName, writerName string, level Level) {
 		Colorize:     CanColorStdout,
 		WriterOption: WriterConsoleOption{},
 	})
-	GetManager().GetLogger(loggerName).RemoveAllWriters().AddWriters(writer)
+	GetManager().GetLogger(loggerName).ReplaceAllWriters(writer)
 }