App Service Certificate Order Certificate never completes the async operation

The endpoint `/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.CertificateRegistration/certificateOrders/{certificateOrderName}/certificates/{name}` is marked with `"x-ms-long-running-operation": true`: https://github.com/Azure/azure-rest-api-specs/blob/4946dbb5b2893a77ce52d08e2a855056e1acd361/specification/web/resource-manager/Microsoft.CertificateRegistration/stable/2021-02-01/AppServiceCertificateOrders.json#L470

However, the `provisioningState` property of the resulting resource to never gets to `Succeeded` (as described in https://docs.microsoft.com/en-us/azure/azure-resource-manager/management/async-operations#provisioningstate-values). Instead, it stays in "Initiazed" ~forever.

A sample response:

```
{"id":"/subscriptions//resourceGroups/rg-test/providers/Microsoft.CertificateRegistration/certificateOrders/cert-order-my-domain-io/certificates/my-domain-io","name":"my-domain-io","type":"Microsoft.CertificateRegistration/certificateOrders/certificates","location":"global","properties":{"keyVaultId":"/subscriptions//resourcegroups/rg-test/providers/microsoft.keyvault/vaults/kv-test","keyVaultSecretName":"my-domain-io","provisioningState":"Initialized"}}
```

Expected: `"provisioningState":"Succeeded"`
Alternatively, consider removing the `x-ms-long-running-operation` annotation.

Start with specification/web/resource-manager/Microsoft.CertificateRegistration/stable/2021-02-01/AppServiceCertificateOrders.json at the certificate endpoint and inspect its x-ms-long-running-operation annotation and provisioningState behavior. Compare the endpoint with the Azure async-operations guidance; done means either the resource reaches Succeeded or the long-running-operation annotation is removed, as confirmed by the resulting response.

Written by the indexing model from the issue text.