Sync eng/common directory with azure-sdk-tools for PR 1553 (#2108)

* Remove condition.

* Fix up system access token usage.

Co-authored-by: Mitch Denny <midenn@microsoft.com>

eng/common/pipelines/templates/steps/retain-run.yml

@@ -6,7 +6,8 @@ parameters:
 steps:
   - task: PowerShell@2
     displayName: Retain pipeline run
-    condition: ${{ parameters.Condition }}
+    env:
+      SYSTEM_ACCESSTOKEN: $(System.AccessToken)
     inputs:
       pwsh: true
       filePath: $(Build.SourcesDirectory)/eng/common/scripts/Add-RetentionLease.ps1
@@ -17,5 +18,5 @@ steps:
         -RunId $(Build.BuildId)
         -OwnerId Pipeline
         -DaysValid ${{parameters.DaysValid}}
-        -Base64EncodedAuthToken $(System.AccessToken)
+        -Base64EncodedAuthToken $env:SYSTEM_ACCESSTOKEN
         -Debug