Map SYSTEM_ACCESSTOKEN into live tests (#36178)

Author: danieljurek

eng/pipelines/templates/steps/build-test.yml

@@ -66,7 +66,9 @@ steps:
   - ${{ if eq('true', parameters.UseFederatedAuth) }}:
     - task: AzurePowerShell@5
       displayName: Run Tests (AzurePowerShell@5)
-      env: ${{ parameters.EnvVars }}
+      env:
+        SYSTEM_ACCESSTOKEN: $(System.AccessToken)
+        ${{ insert }}: ${{ parameters.EnvVars }}
       inputs:
         azureSubscription: ${{ parameters.ServiceConnection }}
         azurePowerShellVersion: LatestVersion
@@ -124,7 +126,9 @@ steps:
     - task: AzurePowerShell@5
       displayName: Test Samples (AzurePowerShell@5)
       condition: and(succeeded(), eq(variables['TestSamples'], 'true'))
-      env: ${{ parameters.EnvVars }}
+      env:
+        SYSTEM_ACCESSTOKEN: $(System.AccessToken)
+        ${{ insert }}: ${{ parameters.EnvVars }}
       inputs:
         azureSubscription: ${{ parameters.ServiceConnection }}
         azurePowerShellVersion: LatestVersion