Create users with no password expiry on AD

[craddm]

✅ Checklist

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⤴️ Summary

Changes the flag $PasswordNeverExpires to $True in the CreateUsers.ps1 script, so that users are created on the DC with the flag set, and preventing their password expiring on the local AD. This was causing log-in attempts on VMs to fail when the user's password was set over 90 days ago, despite still being able to log-in to the TRE in general.

🌂 Related issues

Closes #1443

🔬 Tests

I have tested the modified code on the currently deployed blue SHM.