Sync eng/common directory with azure-sdk-tools for PR 10664 (Azure#2610)

* Add option to perserve auth

* Update eng/common/pipelines/templates/steps/sparse-checkout.yml

Co-authored-by: Copilot <[email protected]>

---------

Co-authored-by: ray chen <[email protected]>
Co-authored-by: Copilot <[email protected]>

Author: 3 people

eng/common/pipelines/templates/steps/sparse-checkout.yml

@@ -14,6 +14,9 @@ parameters:
   - name: TokenToUseForAuth
     type: string
     default: ''
+  - name: PreserveAuthToken
+    type: boolean
+    default: false
 
 steps:
   - ${{ if not(parameters.SkipCheckoutNone) }}:
@@ -137,7 +140,7 @@ steps:
       pwsh: true
       workingDirectory: $(System.DefaultWorkingDirectory)
 
-  - ${{ if ne(parameters.TokenToUseForAuth, '') }}:
+  - ${{ if and(ne(parameters.TokenToUseForAuth, ''), not(parameters.PreserveAuthToken)) }}:
     - pwsh: |
         git config unset --global "http.extraheader"
       displayName: Removing git config auth header