Fix soap addObject category creation bug

[sKarki999]

This PR fixes the issue mentioned in: https://mantis.ilias.de/view.php?id=46688

[dsstrassner]

hi @sKarki999 & @GitHamo you know about the end of the full maintenance for Release 9 at the end of 2025? You should integrate fixes for ILIAS 9 quick before this branch is closed, if the PR code is correct?¿?

see the docu

[sKarki999]

Hi @GitHamo ,

I would like to request for your review for this.
I have reverted declare(strict_types=1) in class.ilSoapObjectAdministration.php for now.

A closer look showed that this file still contains several code paths that rely on PHP’s non-strict typing behavior.
For example, cloneObject() does not guarantee a strictly typed return value. Enabling strict types at this point would require a more comprehensive refactoring and aligning parameter and return types across the SOAP object administration logic.

To avoid introducing new runtime errors in ILIAS 9, strict typing is therefore postponed for now. However, this is a todo task which has to be addressed in ilias 10+.

regards,
Sagun

[GitHamo]

Please don't forget to open a new ticket about safely introducing strict types to ILIAS 10+ or scan for similar issues if it is already introduced

[GitHamo]

This is why the related Mantis ticket has to be connected to a new ticket scanning the same file in later versions to see if the types have the same problem.

[sKarki999]

thank you for your review and sure thing. :)