Rettede filtre for Grupper, Forening og Afdelinger

[mhewel]

Rettede logik for forenings og afdelings filtrene.
Tilføjede "ingen" til alle 3 filtre og "mindst en" for forenings- og afdelings filtrene.

[rasmusselsmark]

Primært til brug for sekretariatet, så de nemmere kan finde admins uden afdelinger, for en bestemt afdeling osv

[what-the-diff]

PR Summary

• Improvements to User Admin Filters
  The filters which allow admin users to segment users based on their group, union, and department affiliations have been expanded. New choices have been added to each filter, offering more granularity when seeking specific user records. In particular, options have been added to allow for filtering on users with 'no group', 'no union' or 'no department', as well as users belonging to 'at least one union' or 'at least one department'.

• Parameter Name Adjustment
  In an administrative improvement, the parameter name has been switched from union_id to department_id in the queryset method of the AdminUserDepartmentListFilter class. This change brings the nomenclature more in line with the object it refers to, increasing understandability of the codebase.

• Enhancements to Queryset Handling
  Updates have been made to the queryset methods in AdminUserUnionListFilter and AdminUserDepartmentListFilter classes. These modifications serve to better handle the "any" option in the filters, providing more accurate results when this selection is made.