Use MicroBuildOutputFolderOverride to move the MicroBuild plugin install directory

Author: dsplaisted

.vsts-ci.yml

@@ -51,6 +51,9 @@ variables:
   - ${{ if and(ne(variables['System.TeamProject'], 'public'), notin(variables['Build.Reason'], 'PullRequest')) }}:
     - group: DotNet-CLI-SDLValidation-Params
   - template: /eng/common/templates-official/variables/pool-providers.yml
+  # Set the MicroBuild plugin installation directory to the agent temp directory to avoid SDL tool scanning.
+  - name: MicroBuildOutputFolderOverride
+    value: $(Agent.TempDirectory)
 
 resources:
   repositories: