Provide ability to run as service account on Windows Server self-hosted

[acnicholls]

Describe the bug When running the configure command of the runner on a Windows Server, you cannot enter a Service Account as the username to run as.

To Reproduce Steps to reproduce the behavior:

1. run .\config.cmd with url and token params
2. follow prompts until run as service prompt, enter Y
3. attempt to enter a service account name as DOMAIN\ServiceAccountName$
4. password request is seen and causes setup to fail due to Service Account Passwords being controlled by the domain controller

Expected behavior account to be recognized as a service account and password prompt to be skipped.

Runner Version and Platform

2.299.1

OS of the machine running the runner? Windows Server 2019

What's not working?

configuration of the runner as a service

Job Log Output

N/A

Runner and Worker's Diagnostic Logs

N/A