Update code-gen.yml for Azure Pipelines (#23700)

Author: Nickcandy

.azure-pipelines/code-gen.yml

@@ -96,6 +96,9 @@ jobs:
       $Title = "Migrate ${{ parameters.ServiceName }} from $SourceBranch to ${{ parameters.TargetBranch }}"
       $HeadBranch = "codegen/${{ parameters.ServiceName }}"
       $BaseBranch = "${{ parameters.TargetBranch }}"
-      $Description = "Migrate ${{ parameters.ServiceName }} from $SourceBranch to ${{ parameters.TargetBranch }}"
+      $Description = "Migrate ${{ parameters.ServiceName }} from $SourceBranch to ${{ parameters.TargetBranch }}
+      The last commit of src/${{ parameters.ServiceName }} in $SourceBranch is:
+      $(git log -1  origin/$SourceBranch -- ./src/${{ parameters.ServiceName }})
+      "
       ./tools/Github/CreatePR.ps1 -Title $Title -HeadBranch $HeadBranch -BaseBranch $BaseBranch -BotAccessToken $(GithubToken) -Description $Description
     displayName: Create PR to main branch