Fix sub-command log level (#25537)

More fix for #24981

* #24981


Close #22361

* #22361

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.

Co-authored-by: Giteabot <teabot@gitea.io>

main.go

@@ -108,7 +108,9 @@ func main() {
 		cmd.CmdActions,
 	}
 
-	// default configuration flags
+	// shared configuration flags, they are for global and for each sub-command at the same time
+	// eg: such command is valid: "./gitea --config /tmp/app.ini web --config /tmp/app.ini", while it's discouraged indeed
+	// keep in mind that the short flags like "-C", "-c" and "-w" are globally polluted, they can't be used for sub-commands anymore.
 	globalFlags := []cli.Flag{
 		cli.HelpFlag,
 		cli.StringFlag{
@@ -128,9 +130,10 @@ func main() {
 
 	// Set the default to be equivalent to cmdWeb and add the default flags
 	app.Flags = append(app.Flags, globalFlags...)
-	app.Flags = append(app.Flags, cmd.CmdWeb.Flags...)
+	app.Flags = append(app.Flags, cmd.CmdWeb.Flags...) // TODO: the web flags polluted the global flags, they are not really global flags
 	app.Action = prepareWorkPathAndCustomConf(cmd.CmdWeb.Action)
 	app.HideHelp = true // use our own help action to show helps (with more information like default config)
+	app.Before = cmd.PrepareConsoleLoggerLevel(log.INFO)
 	app.Commands = append(app.Commands, cmdHelp)
 	for i := range app.Commands {
 		prepareSubcommands(&app.Commands[i], globalFlags)