Fix usergroup issues

Merge Request

Breaking Changes

Nothing breaks

Description

• Get all user groups fixed
• Delete user group with permissions
• Remove unnecessary tests
• Remove System.out.println() statements

Checklist

• The code compiles without any warnings.
• I followed the code review checklist
• The documentation has been added/updated
• There are no System.out.println() statements.

Related Issues

• Related #
• Closes #