HPC cache: failed to provision

The HPC Cache sometimes failed to provision, the polling result from the long running operation is as below:

```
GET https://management.azure.com/subscriptions/xxxx/providers/Microsoft.StorageCache/locations/eastus2/ascOperations/c3bc4af0-4baa-43eb-9ec5-c0b8983fe4c3?api-version=2020-03-01 HTTP/2.0

{
"endTime": "2021-03-11T01:46:53.9869145+00:00",
"error": {
"code": "AscInternalError",
"message": "Error encountered deploying the cache."
},
"name": "c3bc4af0-4baa-43eb-9ec5-c0b8983fe4c3",
"startTime": "2021-03-11T01:21:50.7999428+00:00",
"status": "Failed"
}

```

Start with the reported Azure Storage Cache long-running operation request and response in the issue body, focusing on the failed provisioning result and the AscInternalError message. The issue does not name a specification file, test, or expected correction, so completion criteria are not defined.

Written by the indexing model from the issue text.