improve readability and error catching of CheckFormat.ps1

src/CheckFormat.ps1

@@ -13,23 +13,29 @@ Import-Module (Join-Path $PSScriptRoot Common.psm1) -Function `
 function Main {
     AssertDotnetFormatVersion
 
-    Set-Location $PSScriptRoot
+    $scriptDir = $PSScriptRoot
+    Write-Host "Changing to script directory: $scriptDir"
+    Set-Location $scriptDir
+
     Write-Host "Inspecting the code format with dotnet-format..."
 
     Write-Host "Restoring dotnet tools..."
     dotnet tool restore
 
     $artefactsDir = GetArtefactsDir
+    Write-Host "Creating artefacts directory: $artefactsDir"
     New-Item -ItemType Directory -Force -Path $artefactsDir | Out-Null
 
     $reportPath = Join-Path $artefactsDir "dotnet-format-report.json"
+    Write-Host "Report path: $reportPath"
+
     Write-Host "Running dotnet format..."
     $result = dotnet format --verify-no-changes --report $reportPath --exclude "**/DocTest*.cs" 2>&1
-
     Write-Host "dotnet format output:"
     Write-Host $result
 
     if (Test-Path $reportPath) {
+        Write-Host "Report generated successfully."
         $formatReport = Get-Content $reportPath | ConvertFrom-Json
         if ($formatReport.Count -ge 1) {
             throw "There are $($formatReport.Count) dotnet-format issue(s). The report is stored in: $reportPath"