fix(campaign): get groups allowed to vote for non admin

[armanddidierjean]

This fix will replace the retro compatible PR : aeecleclair/Hyperion#307

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (8f6b9d8) 55.96% compared to head (4bcca3e) 55.94%.
Report is 6 commits behind head on main.

Files	Patch %	Lines
lib/admin/repositories/group_repository.dart	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #234      +/-   ##
==========================================
- Coverage   55.96%   55.94%   -0.02%     
==========================================
  Files         166      166              
  Lines        3581     3582       +1     
==========================================
  Hits         2004     2004              
- Misses       1577     1578       +1     

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