Fix error reporting in Windows preset build job

ghstack-source-id: 342cdf8
ghstack-comment-id: 3169485065
Pull-Request: #13247

Author: GregoryComer

.github/workflows/build-presets.yml

@@ -119,14 +119,16 @@ jobs:
         set -eux
         conda init powershell
         powershell -Command "& {
-          \$ErrorActionPreference = 'Stop'
+          $ErrorActionPreference = 'Stop'
           Set-PSDebug -Trace 1
 
           conda create --yes --quiet -n et python=3.12
           conda activate et
 
           python install_requirements.py
           cmake --preset ${{ matrix.preset }}
+
+          Write-Host "Build exit code: \$LASTEXITCODE"
           \$numCores = [System.Environment]::GetEnvironmentVariable('NUMBER_OF_PROCESSORS') - 1
           cmake --build cmake-out -j \$numCores
         }"