14692 Convert VM disk size (#16434)

* 14692 convert disk size to MB

* 14692 fix list display

* 14692 fix migration

* Update netbox/virtualization/migrations/0039_convert_disk_size.py

Co-authored-by: Jeremy Stretch <jstretch@netboxlabs.com>

---------

Co-authored-by: Jeremy Stretch <jstretch@netboxlabs.com>

netbox/virtualization/migrations/0039_convert_disk_size.py

@@ -0,0 +1,23 @@
+# Generated by Django 5.0.6 on 2024-06-06 17:46
+
+from django.db import migrations
+from django.db.models import F
+
+
+def convert_disk_size(apps, schema_editor):
+    VirtualMachine = apps.get_model('virtualization', 'VirtualMachine')
+    VirtualMachine.objects.filter(disk__isnull=False).update(disk=F('disk') * 1000)
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('virtualization', '0038_virtualdisk'),
+    ]
+
+    operations = [
+        migrations.RunPython(
+            code=convert_disk_size,
+            reverse_code=migrations.RunPython.noop
+        ),
+    ]