Resolve Crashing VerifyChangeLogs (#42545)

Co-authored-by: Copilot <[email protected]>

Author: scbedd

eng/pipelines/templates/jobs/regression.yml

@@ -86,7 +86,7 @@ jobs:
 
       - pwsh: |
           mkdir -p $(TEST_PROXY_FOLDER)
-          python -m pip install -r eng/regression_tools.txt
+          $(PIP_EXE) install -r eng/regression_tools.txt
         displayName: 'Prep Environment'
 
       - template: /eng/common/testproxy/test-proxy-tool.yml

eng/scripts/Language-Settings.ps1

@@ -161,19 +161,21 @@ function Get-AllPackageInfoFromRepo ($serviceDirectory)
   $allPkgPropLines = $null
   try
   {
+    $pathToBuild = (Join-Path $RepoRoot "tools" "azure-sdk-tools[build]")
     # Use ‘uv pip install’ if uv is on PATH, otherwise fall back to python -m pip
     if (Get-Command uv -ErrorAction SilentlyContinue) {
       Write-Host "Using uv pip install"
-      $null = uv pip install "./tools/azure-sdk-tools[build]"
+      $null = uv pip install "$pathToBuild"
       $freezeOutput = uv pip freeze
       Write-Host "Pip freeze output: $freezeOutput"
     } else {
       Write-Host "Using python -m pip install"
-      $null = python -m pip install "./tools/azure-sdk-tools[build]" -q -I
+      $null = python -m pip install "$pathToBuild" -q -I
     }
 
-    Write-Host "Running get_package_properties.py to retrieve package properties"
-    $allPkgPropLines = python (Join-path eng scripts get_package_properties.py) -s $searchPath
+    $scriptLoc = Join-path $RepoRoot eng scripts get_package_properties.py
+    Write-Host "Running '$scriptLoc' to retrieve package properties"
+    $allPkgPropLines = python "$scriptLoc" -s "$(Join-Path $RepoRoot $searchPath)"
   }
   catch
   {