✨(domains) add action required status on MailDomain

Create a new domain status to handle cases where
action is required from an external domain owner
for a domain to be fully functional.

src/backend/mailbox_manager/migrations/0017_alter_maildomain_status.py

@@ -0,0 +1,18 @@
+# Generated by Django 5.1.5 on 2025-02-03 12:59
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('mailbox_manager', '0016_alter_mailbox_domain'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='maildomain',
+            name='status',
+            field=models.CharField(choices=[('pending', 'Pending'), ('enabled', 'Enabled'), ('failed', 'Failed'), ('disabled', 'Disabled'), ('action_required', 'Action required')], default='pending', max_length=20),
+        ),
+    ]