fix: set child process CWD to PowerShell's $PWD in Invoke-MaskedProcess

PowerShell's Set-Location updates $PWD but not .NET's
[Environment]::CurrentDirectory. Invoke-MaskedProcess uses
System.Diagnostics.Process which inherits the .NET CWD, causing
relative paths (like --output ./extracted-artifacts2) to resolve
from the repo root instead of the test directory.

Set WorkingDirectory = $PWD.Path so child processes use the same
directory as the calling PowerShell session.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: Peter Hauge

tests/integration/all-resource-types/modules/LogMasking.psm1

@@ -264,6 +264,7 @@ function Invoke-MaskedProcess {
 
     $psi = [System.Diagnostics.ProcessStartInfo]::new()
     $psi.FileName               = $exe.FilePath
+    $psi.WorkingDirectory       = $PWD.Path
     $psi.RedirectStandardOutput = $true
     $psi.RedirectStandardError  = $true
     $psi.RedirectStandardInput  = $true