Sync eng/common directory with azure-sdk-tools for PR 1552 (#20619)

* Onboarding branch needs to delete the step of updating target ci

* Remove onboarding branch specifically for .NET

Co-authored-by: Sima Zhu <sizhu@microsoft.com>

Author: azure-sdk

eng/common/pipelines/templates/steps/docs-metadata-release.yml

@@ -65,38 +65,3 @@ steps:
     TargetRepoOwner: ${{ parameters.TargetDocRepoOwner }}
     WorkingDirectory: ${{ parameters.WorkingDirectory }}/repo
     ScriptDirectory: ${{ parameters.WorkingDirectory }}/${{ parameters.ScriptDirectory }}
-
-- ${{if ne( parameters['OnboardingBranch'], '')}}:
-  - pwsh: |
-      Push-Location ${{ parameters.WorkingDirectory }}/repo
-      git reset --hard HEAD
-      git remote rm azure-sdk-fork
-      git checkout ${{ parameters.OnboardingBranch}}
-    displayName: Reset Docs Repo, Checkout Onboarding Branch
-    ignoreLASTEXITCODE: false
-
-  - task: PowerShell@2
-    displayName: 'Update Docs.MS CI Targeted Packages'
-    inputs:
-      targetType: filePath
-      filePath: ${{ parameters.ScriptDirectory }}/update-docs-ci.ps1
-      arguments: >
-        -ArtifactLocation ${{ parameters.ArtifactLocation }}
-        -WorkDirectory "${{ parameters.WorkingDirectory }}"
-        -RepoId ${{ parameters.RepoId }}
-        -Repository ${{ parameters.PackageRepository }}
-        -ReleaseSHA ${{ parameters.ReleaseSha }}
-        -DocRepoLocation "${{ parameters.WorkingDirectory }}/repo"
-        -Configs "${{ parameters.CIConfigs }}"
-      pwsh: true
-    env:
-      GH_TOKEN: $(azuresdk-github-pat)
-  - template: /eng/common/pipelines/templates/steps/git-push-changes.yml
-    parameters:
-      BaseRepoBranch: ${{ parameters.OnboardingBranch}}
-      BaseRepoOwner: ${{ parameters.TargetDocRepoOwner }}
-      CommitMsg: "Update docs metadata and targeting for release of ${{ parameters.ArtifactName }}"
-      TargetRepoName: ${{ parameters.TargetDocRepoName }}
-      TargetRepoOwner: ${{ parameters.TargetDocRepoOwner }}
-      WorkingDirectory: ${{ parameters.WorkingDirectory }}/repo
-      ScriptDirectory: ${{ parameters.WorkingDirectory }}/${{ parameters.ScriptDirectory }}