Publish Helix work item logs to artifacts/log/<BuildConfig>/helix-results

Adds a step after Send-to-Helix that copies artifacts/helix-results into
artifacts/log/$(BuildConfig)/helix-results so per-work-item output.log
files are uploaded with the pipeline artifacts. Helix work items that fail
inside the queue currently leave only a portal-auth-protected console URL
in the AzDO log; copying the downloaded result files into the published
artifacts surface them to anyone with build access.

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

Author: kotlarmilos

eng/pipelines/templates/run-performance-job.yml

@@ -245,6 +245,37 @@ jobs:
         parameters:
           osGroup: ${{ parameters.osGroup }}
           projectFile: $(_projectFile)
+      - ${{ if eq(parameters.osGroup, 'windows') }}:
+        - task: PowerShell@2
+          displayName: Copy Helix work item logs to artifacts/log
+          inputs:
+            targetType: inline
+            script: |
+              $src = "$(System.DefaultWorkingDirectory)/artifacts/helix-results"
+              $dst = "$(System.DefaultWorkingDirectory)/artifacts/log/$(BuildConfig)/helix-results"
+              if (Test-Path $src) {
+                New-Item -ItemType Directory -Force -Path $dst | Out-Null
+                Copy-Item -Path "$src/*" -Destination $dst -Recurse -Force -ErrorAction SilentlyContinue
+                Write-Host "Copied $src -> $dst"
+              } else {
+                Write-Host "No helix-results directory present at $src"
+              }
+          continueOnError: true
+          condition: always()
+      - ${{ if ne(parameters.osGroup, 'windows') }}:
+        - script: |
+            src="$(System.DefaultWorkingDirectory)/artifacts/helix-results"
+            dst="$(System.DefaultWorkingDirectory)/artifacts/log/$(BuildConfig)/helix-results"
+            if [ -d "$src" ]; then
+              mkdir -p "$dst"
+              cp -R "$src"/. "$dst"/ 2>/dev/null || true
+              echo "Copied $src -> $dst"
+            else
+              echo "No helix-results directory present at $src"
+            fi
+          displayName: Copy Helix work item logs to artifacts/log
+          continueOnError: true
+          condition: always()
       - ${{ if eq(parameters.osGroup, 'windows') }}:
         - task: PowerShell@2
           displayName: Redact Logs