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By default, Windows clients are not allowed to run Powershell scripts [1]. Since our way of understanding `./mach` in Powershell is to have a `mach.ps1` script, we should have instructions for configuring Windows to properly understand and invoke it. `RemoteSigned` is a good default, because it maintains security, while allowing "local scripts" (such as those from VCS) to run. [1] https://docs.microsoft.com/en-ca/powershell/module/microsoft.powershell.core/about/about_execution_policies?view=powershell-7.2 Differential Revision: https://phabricator.services.mozilla.com/D141400