Added presteps support to auto-release template (#48053)

Co-authored-by: Ray Chen <raychen@microsoft.com>

Author: azure-sdk-automation[bot]

eng/common/pipelines/templates/stages/archetype-auto-release-prepare.yml

@@ -9,6 +9,12 @@ parameters:
   - name: Condition
     type: string
     default: succeeded()
+  # Language-specific steps that run (in the resolve job) before the package-detection script.
+  # Repos whose Get-AllPackageInfoFromRepo needs tooling set up first (e.g. Python installing
+  # azure-sdk-tools from an authenticated feed) pass those steps here. Default is none.
+  - name: PreSteps
+    type: stepList
+    default: []
 
 stages:
   # Post-merge auto-release preparation, shared across language repos (this file lives in the synced
@@ -44,6 +50,10 @@ stages:
 
           - template: /eng/common/pipelines/templates/steps/login-to-github.yml
 
+          # Optional language-specific environment setup (e.g. Python: UsePythonVersion + feed auth so
+          # the in-script azure-sdk-tools install resolves from an authenticated, reachable feed).
+          - ${{ parameters.PreSteps }}
+
           - task: PowerShell@2
             name: resolve
             displayName: Determine releasable packages