Remove xvfb step when building

Author: Kartik Raj

build/azure-pipelines/templates/pack-steps.yml

@@ -12,8 +12,3 @@ steps:
   - script: npm install
     workingDirectory: $(Build.SourcesDirectory)/${{ parameters.package }}
     displayName: Install package dependencies
-  - bash: |
-      /usr/bin/Xvfb :99 -screen 0 1024x768x24 > /dev/null 2>&1 &
-      echo ">>> Started xvfb"
-    displayName: Start xvfb
-    condition: eq(variables['Agent.OS'], 'Linux')