DockerBuildContext.from_local_directory is using the incorrect variable for the storage account url

I'd been trying to create an environment using a local directory but I kept running into the following error:

```
ValueError: Invalid URL: https:///subscriptions//resourceGroups//providers/Microsoft.Storage/storageAccounts/
```

On further inspection, I noticed that in the `from_local_directory` function, the incorrect variable is probably being passed to the `account_url` argument of the `BlobServiceClient` constructor. I suppose a storage account URL needs to be constructed using the storage account name and endpoint. However, the `storage_account_full` variable, is being passed to it instead.

**azureml-core version: 1.45.0.post2**