WebhookStore migration (#15042)

* Migration completed

* Fix tests

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

app/channel.go

@@ -1128,13 +1128,13 @@ func (a *App) DeleteChannel(channel *model.Channel, userId string) *model.AppErr
 
 	go func() {
 		webhooks, err := a.Srv().Store.Webhook().GetIncomingByChannel(channel.Id)
-		ihc <- store.StoreResult{Data: webhooks, Err: err}
+		ihc <- store.StoreResult{Data: webhooks, NErr: err}
 		close(ihc)
 	}()
 
 	go func() {
 		outgoingHooks, err := a.Srv().Store.Webhook().GetOutgoingByChannel(channel.Id, -1, -1)
-		ohc <- store.StoreResult{Data: outgoingHooks, Err: err}
+		ohc <- store.StoreResult{Data: outgoingHooks, NErr: err}
 		close(ohc)
 	}()
 
@@ -1148,13 +1148,13 @@ func (a *App) DeleteChannel(channel *model.Channel, userId string) *model.AppErr
 	}
 
 	ihcresult := <-ihc
-	if ihcresult.Err != nil {
-		return ihcresult.Err
+	if ihcresult.NErr != nil {
+		return model.NewAppError("DeleteChannel", "app.webhooks.get_incoming_by_channel.app_error", nil, ihcresult.NErr.Error(), http.StatusInternalServerError)
 	}
 
 	ohcresult := <-ohc
-	if ohcresult.Err != nil {
-		return ohcresult.Err
+	if ohcresult.NErr != nil {
+		return model.NewAppError("DeleteChannel", "app.webhooks.get_outgoing_by_channel.app_error", nil, ohcresult.NErr.Error(), http.StatusInternalServerError)
 	}
 
 	incomingHooks := ihcresult.Data.([]*model.IncomingWebhook)
@@ -2340,11 +2340,11 @@ func (a *App) PermanentDeleteChannel(channel *model.Channel) *model.AppError {
 	}
 
 	if err := a.Srv().Store.Webhook().PermanentDeleteIncomingByChannel(channel.Id); err != nil {
-		return err
+		return model.NewAppError("PermanentDeleteChannel", "app.webhooks.permanent_delete_incoming_by_channel.app_error", nil, err.Error(), http.StatusInternalServerError)
 	}
 
 	if err := a.Srv().Store.Webhook().PermanentDeleteOutgoingByChannel(channel.Id); err != nil {
-		return err
+		return model.NewAppError("PermanentDeleteChannel", "app.webhooks.permanent_delete_outgoing_by_channel.app_error", nil, err.Error(), http.StatusInternalServerError)
 	}
 
 	if nErr := a.Srv().Store.Channel().PermanentDelete(channel.Id); nErr != nil {