Exclude samples folder from externaldocreferences (#1146)

Author: DaveTryon

pipelines/build-test-tool-template.yaml

@@ -42,4 +42,7 @@ steps:
     displayName: "Publish code coverage (Windows only)"
     condition: eq(variables['Agent.OS'], 'Windows_NT')
     inputs:
-      summaryFileLocation: '$(Agent.TempDirectory)/coverage.cobertura.xml'
+      summaryFileLocation: '$(Agent.TempDirectory)/coverage.cobertura.xml'
+
+  - powershell: 'Remove-Item -Path $(Build.SourcesDirectory)/samples -Recurse -Force'
+    displayName: 'Remove Samples to avoid treating them as external doc references'