[ci] Enable CodeQL static analysis.

Author: jpobst

build-tools/automation/azure-pipelines.yaml

@@ -28,6 +28,7 @@ variables:
   1ESWindowsImage: AzurePipelinesWindows2022compliant
   1ESMacPool: Azure Pipelines
   1ESMacImage: internal-macos-11
+  Codeql.Enabled: true
 
 jobs:
 - job: windows_build