Run gopls modernize on codebase (#34751)

Recent modernize fixes:
https://github.com/golang/tools/commits/master/gopls/internal/analysis/modernize

modules/setting/log.go

@@ -227,8 +227,8 @@ func initLoggerByName(manager *log.LoggerManager, rootCfg ConfigProvider, logger
 	}
 
 	var eventWriters []log.EventWriter
-	modes := strings.Split(modeVal, ",")
-	for _, modeName := range modes {
+	modes := strings.SplitSeq(modeVal, ",")
+	for modeName := range modes {
 		modeName = strings.TrimSpace(modeName)
 		if modeName == "" {
 			continue