Bug 34838: Use ->set to avoid method redefinition warnings

Bug 34838: Use ->set to avoid method redefinition warnings

This patch silences more warnings. To test

1. Be on 23.11.x
2. Apply the patches before this one
3. Run:
   $ ktd --shell
  k$ prove t/db_dependent/Illrequests.t
=> FAIL: Lots of warnings like this:
Subroutine Koha::Illrequest::SUPER::status redefined at /kohadevbox/koha/Koha/Object.pm line 955.
Subroutine Koha::Illrequest::SUPER::status_alias redefined at /kohadevbox/koha/Koha/Object.pm line 955.
illrequestattributes is DEPRECATED in favor of extended_attributes at t/db_dependent/Illrequests.t line 1071.
4. Apply this patch
5. Repeat 3
=> SUCCESS: No more warnings!
6. Sign off :-D

Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>