Build.Password is not set when using SSH on windows

#### Overview of the Issue
When using the new SSH on Windows functionality, it doesn't appear to be setting build.Password (that is recommend [here](https://developer.hashicorp.com/packer/docs/provisioners/powershell#elevated_user)).

It seems to be the same issue as https://github.com/hashicorp/packer-plugin-azure/issues/267

#### Reproduction Steps
using this provisioner

```
provisioner "powershell" {
environment_vars = ["WINDOWSPASS=${build.Password}"]
scripts = [demo.ps1"]
}
```

with a demo.ps1
```
Write-Host "Windows Administrator password is: $Env:WINDOWSPASS"
```

##### Current output
```
Using SSH communicator to connect: x.x.x.x
Waiting for SSH to become available...
Connected to SSH!
Provisioning with Powershell...
Provisioning with powershell script: demo.ps1
Windows Administrator password is:
```

Windows password is empty!

### Plugin and Packer version

packer version: Packer v1.10.0
packer-plugin-amazon version: 1.2.8