[GH-16199] add IsValid to model OpenDialogRequest (#26526)

* [GH-16199] add IsValid to model OpenDialogRequest

* [GH-16199] add IsValid to model OpenDialogRequest, revert remove of translations

* [GH-16199] fix tests after revert

* [GH-16199] add IsValid to model OpenDialogRequest

* [GH-16199] revert validation of icon url

* [GH-16199] update go sum

* [GH-16199] log warning for invalid dialog

* [GH-16199] log error for invalid dialog

* [GH-16199] log warning for invalid dialog

* [GH-16199] fix golang-ci

---------

Co-authored-by: Lukas Eipert <git@leipert.io>
Co-authored-by: Mattermost Build <build@mattermost.com>

server/channels/app/integration_action.go

@@ -453,13 +453,17 @@ func (a *App) DoLocalRequest(c request.CTX, rawURL string, body []byte) (*http.R
 	return a.doPluginRequest(c, "POST", rawURL, nil, body)
 }
 
-func (a *App) OpenInteractiveDialog(request model.OpenDialogRequest) *model.AppError {
+func (a *App) OpenInteractiveDialog(c request.CTX, request model.OpenDialogRequest) *model.AppError {
 	timeout := time.Duration(*a.Config().ServiceSettings.OutgoingIntegrationRequestsTimeout) * time.Second
 	clientTriggerId, userID, appErr := request.DecodeAndVerifyTriggerId(a.AsymmetricSigningKey(), timeout)
 	if appErr != nil {
 		return appErr
 	}
 
+	if dialogErr := request.IsValid(); dialogErr != nil {
+		c.Logger().Warn("Interactive dialog is invalid", mlog.Err(dialogErr))
+	}
+
 	request.TriggerId = clientTriggerId
 
 	jsonRequest, err := json.Marshal(request)