fix(group): add missing group column to model mapping

[MyvTsv]

• I have performed a self-review of my code.
• I have added tests (when available) that prove my fix is effective or that my feature works.
• I have updated the CHANGELOG with a short functional description of the fix or new feature.
• This change requires a documentation update.

Description

• It fixes !41813
• In GLPI 10, it was possible to select the group and the group responsible for an item via mapping.
  Since the migration to GLPI 11, the Group option is no longer available in mapping, which prevents its use during configuration.

This pull request restores the ability to select the group and the group responsible in mapping.

Screenshots (if appropriate):

[stonebuzz]

Hi @MyvTsv,
Could you please verify that this PR #555
is functioning correctly at all times?

Thank you!