[Bug] 500 Internal Server Error from UserController::getAction with many object dependencies

[jantomicky]

The action attempts to load all user dependent objects, see: https://github.com/pimcore/admin-ui-classic-bundle/blob/1.x/src/Controller/Admin/UserController.php#L406

When there are too many dependent objects, this fails with:

1. 500 Internal Server Error (presumably with Allowed memory size of * bytes exhausted)
2. No message(s)
3. Breaking the Pimcore UI (a reload is required)

Also, when there is moderate number of dependent objects & the table is rendered successfully, it is not scrollable.

[github-actions]

Thanks a lot for reporting the issue. We did not consider the issue as "Pimcore:Priority", "Pimcore:ToDo" or "Pimcore:Backlog", so we're not going to work on that anytime soon. Please create a pull request to fix the issue if this is a bug report. We'll then review it as quickly as possible. If you're interested in contributing a feature, please contact us first here before creating a pull request. We'll then decide whether we'd accept it or not. Thanks for your understanding.