Sync eng/common directory with azure-sdk-tools for PR 1558 (#18178)

* Set default branch to master if not set from git

* Added log messages

* Silent the failure if not able fetch default branch from git

* Update git-push-changes.yml

Co-authored-by: Sima Zhu <sizhu@microsoft.com>
Co-authored-by: Sima Zhu <48036328+sima-zhu@users.noreply.github.com>

eng/common/pipelines/templates/steps/set-default-branch.yml

@@ -4,7 +4,12 @@ parameters:
 steps:
 - pwsh: |
     $setDefaultBranch = (git remote show ${{ parameters.RemoteRepo }} | Out-String) -replace "(?ms).*HEAD branch: (\w+).*", '$1'
+    if ($LASTEXITCODE -ne 0) {
+      Write-Host "Not able to fetch the default branch from git command. Set to master."
+      $setDefaultBranch = 'master'
+    }
     Write-Host "Setting DefaultBranch=$setDefaultBranch"
-    echo "##vso[task.setvariable variable=DefaultBranch]$setDefaultBranch"
+    Write-Host "##vso[task.setvariable variable=DefaultBranch]$setDefaultBranch"
   displayName: "Setup Default Branch"
   workingDirectory: ${{ parameters.workingDirectory }}
+  ignoreLASTEXITCODE: true