Consistent error wrapping (#30600)

server/channels/app/webhook.go

@@ -372,7 +372,7 @@ func (a *App) CreateWebhookPost(c request.CTX, userID string, channel *model.Cha
 
 	for _, split := range splits {
 		if _, err = a.CreatePost(c, split, channel, model.CreatePostFlags{}); err != nil {
-			return nil, model.NewAppError("CreateWebhookPost", "api.post.create_webhook_post.creating.app_error", nil, "err="+err.Message, http.StatusInternalServerError)
+			return nil, model.NewAppError("CreateWebhookPost", "api.post.create_webhook_post.creating.app_error", nil, "", http.StatusInternalServerError).Wrap(err)
 		}
 	}