Use updated timestamp when pinging new subscriptions (#637)

fixbackend/cloud_accounts/azure_subscription_repo.py

@@ -121,7 +121,7 @@ async def get_by_tenant(self, tenant_id: WorkspaceId) -> Optional[AzureSubscript
     async def list_created_after(self, time: datetime) -> List[AzureSubscriptionCredentials]:
         async with self._session_maker() as session:
             query = select(AzureSubscriptionCredentialsEntity).filter(
-                AzureSubscriptionCredentialsEntity.created_at > time
+                AzureSubscriptionCredentialsEntity.updated_at > time
             )
             result = await session.execute(query)
             return [entity.to_model() for entity in result.scalars()]