[MM-57826] Make sure the original errors are wrapped when AppErrors are returned (#26771)

Co-authored-by: Ibrahim Serdar Acikgoz <serdaracikgoz86@gmail.com>

server/channels/app/group.go

@@ -249,9 +249,9 @@ func (a *App) RestoreGroup(groupID string) (*model.Group, *model.AppError) {
 		var nfErr *store.ErrNotFound
 		switch {
 		case errors.As(err, &nfErr):
-			return nil, model.NewAppError("RestoreGroup", "app.group.no_rows", nil, nfErr.Error(), http.StatusNotFound)
+			return nil, model.NewAppError("RestoreGroup", "app.group.no_rows", nil, "", http.StatusNotFound).Wrap(nfErr)
 		default:
-			return nil, model.NewAppError("RestoreGroup", "app.update_error", nil, err.Error(), http.StatusInternalServerError)
+			return nil, model.NewAppError("RestoreGroup", "app.update_error", nil, "", http.StatusInternalServerError).Wrap(err)
 		}
 	}