[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/notification.go

@@ -225,7 +225,7 @@ func (a *App) SendNotifications(post *model.Post, team *model.Team, channel *mod
 
 			//If email verification is required and user email is not verified don't send email.
 			if *a.Config().EmailSettings.RequireEmailVerification && !profileMap[id].EmailVerified {
-				mlog.Error("Skipped sending notification email, address not verified.", mlog.String("user_email", profileMap[id].Email), mlog.String("user_id", id))
+				mlog.Debug("Skipped sending notification email, address not verified.", mlog.String("user_email", profileMap[id].Email), mlog.String("user_id", id))
 				continue
 			}