Put the temporary password in the keyvault too.

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#### Description

If you need to faultfind a build, you need the temporary password generated by Packer to RDP into the VM. As far as I know, this is currently only output if you thought to start with `-debug` (and pressed enter a bunch times). The azure-arm builder already creates an Azure KeyVault to store the winrm certificate. Could it also put a secret in there with the temporary password?

#### Use Case(s)

Any faultfinding of a Windows VM being built by Packer.

#### Potential configuration

```
```

#### Potential References

Start at the azure-arm builder and inspect how it creates the Azure KeyVault and stores the WinRM certificate. Determine where the Packer-generated temporary password is available and how a KeyVault secret should be created; done means the password is stored for faultfinding of the built Windows VM.

Written by the indexing model from the issue text.