Adds comments field to abstract NestedGroupModel and associated migrations

Models affected:
- dcim: `Location`, `Region`, `SiteGroup`
- tenancy`: `ContactGroup`, `TenantGroup`
- wireless: `WirelessLANGroup`

netbox/tenancy/migrations/0018_contactgroup_comments_tenantgroup_comments.py

@@ -0,0 +1,23 @@
+# Generated by Django 5.1.7 on 2025-03-10 16:37
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('tenancy', '0017_natural_ordering'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='contactgroup',
+            name='comments',
+            field=models.TextField(blank=True),
+        ),
+        migrations.AddField(
+            model_name='tenantgroup',
+            name='comments',
+            field=models.TextField(blank=True),
+        ),
+    ]