stripe: Raise 'MissingDataError' while fetching license count.

If the RemoteRealmAuditLog has stale data, it means the server
stopped or never uploaded data. We raise MissingDataError in such
cases when a user action led to calculating licenses count from
stale data.

zilencer/migrations/0046_remotezulipserver_last_audit_log_update.py

@@ -0,0 +1,17 @@
+# Generated by Django 4.2.7 on 2023-12-06 18:23
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("zilencer", "0045_remoterealmauditlog_zilencer_remoterealmauditlog_server_realm_and_more"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="remotezulipserver",
+            name="last_audit_log_update",
+            field=models.DateTimeField(null=True),
+        ),
+    ]