WebhookStore migration (#15042)

* Migration completed

* Fix tests

Co-authored-by: Jesús Espino <jespinog@gmail.com>

app/user.go

@@ -1465,11 +1465,11 @@ func (a *App) PermanentDeleteUser(user *model.User) *model.AppError {
 	}
 
 	if err := a.Srv().Store.Webhook().PermanentDeleteIncomingByUser(user.Id); err != nil {
-		return err
+		return model.NewAppError("PermanentDeleteUser", "app.webhooks.permanent_delete_incoming_by_user.app_error", nil, err.Error(), http.StatusInternalServerError)
 	}
 
 	if err := a.Srv().Store.Webhook().PermanentDeleteOutgoingByUser(user.Id); err != nil {
-		return err
+		return model.NewAppError("PermanentDeleteUser", "app.webhooks.permanent_delete_outgoing_by_user.app_error", nil, err.Error(), http.StatusInternalServerError)
 	}
 
 	if err := a.Srv().Store.Command().PermanentDeleteByUser(user.Id); err != nil {