automation: transition to Windows Server 2022 Let's keep our Windows build environment modern by upgrading to the latest OS. As part of the upgrade, we pick up a migration to EC2Launch Version 2. This has a different config mechanism. So we need to port how we manage the administrator password. As part of migrating to the new YAML/JSON config file mechanism, we move the code to the powershell script that is run when the instance first launches. This ensures that the config is retained during the reboot we perform as part of building the Windows AMI. The motivation for this is I'm currently unable to build the Windows 2019 AMI due to an issue installing OpenSSH. This _just works_ on Windows Server 2022. I have no clue what the root cause is. I think it might have something to do with Microsoft not publishing the files in the right location. Differential Revision: https://phab.mercurial-scm.org/D12630