[MM-31573] update log levels for the app package (#16629)

* update log levels for the app package

* reflect review comments

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

app/bot.go

@@ -137,7 +137,6 @@ func (a *App) getOrCreateWarnMetricsBot(botDef *model.Bot) (*model.Bot, *model.A
 	//return the bot for this user
 	savedBot, appErr := a.GetBot(botUser.Id, false)
 	if appErr != nil {
-		mlog.Error(appErr.Error())
 		return nil, appErr
 	}
 
@@ -354,7 +353,7 @@ func (a *App) disableUserBots(userId string) *model.AppError {
 		for _, bot := range userBots {
 			_, err := a.UpdateBotActive(bot.UserId, false)
 			if err != nil {
-				mlog.Error("Unable to deactivate bot.", mlog.String("bot_user_id", bot.UserId), mlog.Err(err))
+				mlog.Warn("Unable to deactivate bot.", mlog.String("bot_user_id", bot.UserId), mlog.Err(err))
 			}
 		}
 
@@ -555,7 +554,7 @@ func (a *App) DeleteBotIconImage(botUserId string) *model.AppError {
 	}
 
 	if nErr := a.Srv().Store.User().UpdateLastPictureUpdate(botUserId); nErr != nil {
-		mlog.Error(nErr.Error())
+		mlog.Warn(nErr.Error())
 	}
 
 	bot.LastIconUpdate = int64(0)