fix(ipam): Remove FHRP IP prefix constraint

Remove `FHRPGroupAssignmentForm.__init__` logic that tied group choices
to the interface IP prefix. Add `group_id` to the `q` filter to enable
matching by group ID.

Fixes #19262

netbox/ipam/filtersets.py

@@ -804,6 +804,7 @@ class FHRPGroupFilterSet(NetBoxModelFilterSet):
             return queryset
         return queryset.filter(
             Q(description__icontains=value) |
+            Q(group_id__contains=value) |
             Q(name__icontains=value)
         )
 

netbox/ipam/forms/model_forms.py

@@ -580,13 +580,6 @@ class FHRPGroupAssignmentForm(forms.ModelForm):
         model = FHRPGroupAssignment
         fields = ('group', 'priority')
 
-    def __init__(self, *args, **kwargs):
-        super().__init__(*args, **kwargs)
-
-        ipaddresses = self.instance.interface.ip_addresses.all()
-        for ipaddress in ipaddresses:
-            self.fields['group'].widget.add_query_param('related_ip', ipaddress.pk)
-
     def clean_group(self):
         group = self.cleaned_data['group']